[geary/wip/728002-webkit2] Make web process extension console logging a bit less verbose.

[Michael Gratton <mjog src gnome org>]

commit 0e747046aa122890618f25fecfc7dbefcecf558e
Author: Michael James Gratton <mike vee net>
Date:   Thu Jan 26 13:31:55 2017 +1100

    Make web process extension console logging a bit less verbose.

 src/client/web-process/web-process-extension.vala |    7 ++++---
 1 files changed, 4 insertions(+), 3 deletions(-)
---
diff --git a/src/client/web-process/web-process-extension.vala 
b/src/client/web-process/web-process-extension.vala
index 2fc4067..2eda53c 100644
--- a/src/client/web-process/web-process-extension.vala
+++ b/src/client/web-process/web-process-extension.vala
@@ -52,10 +52,11 @@ public class GearyWebExtension : Object {
     // XXX Conditionally enable while we still depend on WK2 <2.12
     private void on_console_message(WebKit.WebPage page,
                                     WebKit.ConsoleMessage message) {
+        string source = message.get_source_id();
         debug("Console: [%s] %s %s:%u: %s",
-              message.get_level().to_string(),
-              message.get_source().to_string(),
-              message.get_source_id(),
+              message.get_level().to_string().substring("WEBKIT_CONSOLE_MESSAGE_LEVEL_".length),
+              message.get_source().to_string().substring("WEBKIT_CONSOLE_MESSAGE_SOURCE_".length),
+              Geary.String.is_empty(source) ? "unknown" : source,
               message.get_line(),
               message.get_text()
         );