[gnome-games] ui: Remove explicit .titlebar from HdyHeaderBar

[Alexander Mikhaylenko <alexm src gnome org>]

commit 0a3ec2b8373c2e7e14779533bfb85150f6bbf32c
Author: Alexander Mikhaylenko <alexm gnome org>
Date:   Wed May 27 16:25:50 2020 +0500

    ui: Remove explicit .titlebar from HdyHeaderBar
    
    See https://gitlab.gnome.org/GNOME/libhandy/-/merge_requests/470

 data/ui/collection-view.ui              | 6 ------
 data/ui/display-view.ui                 | 6 ------
 data/ui/preferences-subpage-gamepad.ui  | 4 ----
 data/ui/preferences-subpage-keyboard.ui | 4 ----
 4 files changed, 20 deletions(-)
---
diff --git a/data/ui/collection-view.ui b/data/ui/collection-view.ui
index 984c0488..e48e3685 100644
--- a/data/ui/collection-view.ui
+++ b/data/ui/collection-view.ui
@@ -19,9 +19,6 @@
             <property name="visible">True</property>
             <property name="show-close-button">True</property>
             <property name="centering-policy">strict</property>
-            <style>
-              <class name="titlebar"/>
-            </style>
             <child>
               <object class="GtkButton" id="add_game">
                 <property name="visible">True</property>
@@ -111,9 +108,6 @@
             <property name="visible">True</property>
             <property name="show_close_button">True</property>
             <property name="title" bind-source="platform_view" bind-property="subview-title"/>
-            <style>
-              <class name="titlebar"/>
-            </style>
             <child>
               <object class="GtkButton">
                 <property name="visible">True</property>
diff --git a/data/ui/display-view.ui b/data/ui/display-view.ui
index 065200cd..88b5b61e 100644
--- a/data/ui/display-view.ui
+++ b/data/ui/display-view.ui
@@ -20,9 +20,6 @@
                 <property name="visible">True</property>
                 <property name="title" bind-source="GamesDisplayView" bind-property="game-title" 
bind-flags="bidirectional"/>
                 <property name="show-close-button" bind-source="GamesDisplayView" 
bind-property="is-fullscreen" bind-flags="bidirectional|sync-create|invert-boolean"/>
-                <style>
-                  <class name="titlebar"/>
-                </style>
                 <child>
                   <object class="GtkButton" id="back">
                     <property name="visible">True</property>
@@ -142,9 +139,6 @@
               <object class="HdyHeaderBar" id="snapshots_header_bar">
                 <property name="visible">True</property>
                 <property name="title" bind-source="GamesDisplayView" bind-property="game-title" 
bind-flags="bidirectional"/>
-                <style>
-                  <class name="titlebar"/>
-                </style>
                 <child>
                   <object class="GtkButton">
                     <property name="sensitive">False</property>
diff --git a/data/ui/preferences-subpage-gamepad.ui b/data/ui/preferences-subpage-gamepad.ui
index 87ca8889..986d1d54 100644
--- a/data/ui/preferences-subpage-gamepad.ui
+++ b/data/ui/preferences-subpage-gamepad.ui
@@ -15,9 +15,6 @@
               <object class="HdyHeaderBar" id="tester_header_bar">
                 <property name="visible">True</property>
                 <property name="show-close-button">True</property>
-                <style>
-                  <class name="titlebar"/>
-                </style>
                 <child>
                   <object class="GtkButton">
                     <property name="visible">True</property>
@@ -85,7 +82,6 @@
               <object class="HdyHeaderBar" id="mapper_header_bar">
                 <property name="visible">True</property>
                 <style>
-                  <class name="titlebar"/>
                   <class name="selection-mode"/>
                 </style>
                 <child>
diff --git a/data/ui/preferences-subpage-keyboard.ui b/data/ui/preferences-subpage-keyboard.ui
index dc142fad..92c162ee 100644
--- a/data/ui/preferences-subpage-keyboard.ui
+++ b/data/ui/preferences-subpage-keyboard.ui
@@ -17,9 +17,6 @@
                 <property name="visible">True</property>
                 <property name="show-close-button">True</property>
                 <property name="title" translatable="true">Testing Keyboard</property>
-                <style>
-                  <class name="titlebar"/>
-                </style>
                 <child>
                   <object class="GtkButton">
                     <property name="visible">True</property>
@@ -88,7 +85,6 @@
                 <property name="visible">True</property>
                 <property name="title" translatable="true">Configuring Keyboard</property>
                 <style>
-                  <class name="titlebar"/>
                   <class name="selection-mode"/>
                 </style>
                 <child>