Make sure keybindings removed don't come back during extension update.

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 aabb1fdd0da3d29739fb8e9022ce570e6c83834a..a9a193796164a27742fe6bb00d5748bb0075b40b 100644
--- a/chrome/browser/extensions/extension_prefs.h
+++ b/chrome/browser/extensions/extension_prefs.h
@@ -512,6 +512,12 @@ class ExtensionPrefs : public ContentSettingsStore::Observer,
   // Returns true if the extension was installed as a default app.
   bool WasInstalledByDefault(const std::string& extension_id) const;
 
+  // Gets/Sets a flag with the extension that signifies that the initial
+  // keybindings have been assigned (so that it is not overwritten when the
+  // extension updates).
+  void SetInitialBindingsHaveBeenAssigned(const std::string& extension_id);
+  bool InitialBindingsHaveBeenAssigned(const std::string& extension_id) const;
+
   // Helper method to acquire the installation time of an extension.
   // Returns base::Time() if the installation time could not be parsed or
   // found.