Do not load extension system in the Profile import process.

chrome/browser/extensions/component_loader.h

Index: chrome/browser/extensions/component_loader.h
diff --git a/chrome/browser/extensions/component_loader.h b/chrome/browser/extensions/component_loader.h
index 02798b31b01616aacd5dc612546214c6831aee61..4b51dc4c8d1cee13f1b8adcdc6c08bb4fd664cbe 100644
--- a/chrome/browser/extensions/component_loader.h
+++ b/chrome/browser/extensions/component_loader.h
@@ -32,8 +32,12 @@ class ComponentLoader {
     return component_extensions_.size();
   }
 
-  // Loads any registered component extensions.
-  void LoadAll();
+  // Loads registered component extensions. Extensions with background pages
+  // will be deferred until LoadDeferred if the argument is true.

[Yoyo Zhou, 2012/12/19 21:50:38]

LoadAllDeferred

[tapted, 2012/12/19 22:58:24]

Done.

+  void LoadAll(bool defer_extensions_with_background_pages);

[Yoyo Zhou, 2012/12/19 21:50:38]

Reading LoadAll(false) in the code isn't very self-descriptive. I'd prefer this
to be 2 functions, like LoadAllNow and LoadAllDeferringBackgroundPages (this
name isn't any good so feel free to improve it).

[tapted, 2012/12/19 22:58:24]

Done. I went with
- BulkLoadAll
- BulkLoadDeferBackgroundPages
- BulkLoadDeferred

(I also toyed with an enum in an earlier iteration, since true/false was giving
me an itch too).

+
+  // Load component extensions deferred in the last call to LoadAll(true).
+  void LoadAllDeferred();
 
   // Clear the list of all registered extensions and unloads them from the
   // extension service.
@@ -111,7 +115,8 @@ class ComponentLoader {
                   const FilePath& root_directory);
 
   // Loads a registered component extension.
-  const Extension* Load(const ComponentExtensionInfo& info);
+  void Load(const ComponentExtensionInfo& info,

[tapted, 2012/12/19 13:19:14]

(note: return type changed to void - nothing used it, and it raises fewer
questions this way)

+            bool defer_if_has_background_page);
 
   void AddDefaultComponentExtensionsWithBackgroundPages(
       bool skip_session_components);
@@ -140,6 +145,10 @@ class ComponentLoader {
 
   PrefChangeRegistrar pref_change_registrar_;
 
+  // Extensions with background pages deferred by LoadAll(true).
+  typedef std::vector<scoped_refptr<const Extension> > DeferredAtLoadExtensions;
+  DeferredAtLoadExtensions deferred_at_load_extensions;
+
   DISALLOW_COPY_AND_ASSIGN(ComponentLoader);
 };