Disable sync for default apps

chrome/browser/extensions/extension_prefs.h

Index: chrome/browser/extensions/extension_prefs.h
diff --git a/chrome/browser/extensions/extension_prefs.h b/chrome/browser/extensions/extension_prefs.h
index 6a7a7d7dae82137980d45e0c1c76743800ad0a71..27ad3a542364401328aa7cdc65fc6b3b9ec7a36c 100644
--- a/chrome/browser/extensions/extension_prefs.h
+++ b/chrome/browser/extensions/extension_prefs.h
@@ -429,6 +429,9 @@ class ExtensionPrefs : public ContentSettingsStore::Observer,
   // bookmark.
   bool IsFromBookmark(const std::string& extension_id) const;
 
+  // Returns true if the extension was installed as default app.

[Mihai Parparita -not on Chrome, 2012/08/24 21:05:23]

"as a default app" is more correct.

+  bool IsFromDefault(const std::string& extension_id) const;

[Mihai Parparita -not on Chrome, 2012/08/24 21:05:23]

"from default" doesn't quite sound right. WasInstalledByDefaultApps perhaps?
Though Aaron asked for a more generic name than "apps", so perhaps just
WasInstalledByDefault. Whatever name you choose should be used for the key name
and other variable names.

+
   // Helper method to acquire the installation time of an extension.
   // Returns base::Time() if the installation time could not be parsed or
   // found.