Revert changes to have ExtensionService notify ThemeService directly for themes

chrome/browser/themes/theme_service.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/themes/theme_service.h"
 
 #include "base/bind.h"
 #include "base/memory/ref_counted_memory.h"
 #include "base/sequenced_task_runner.h"
 #include "base/string_split.h"
@@ skipping 206 matching lines @@
 }
 
 ThemeService::~ThemeService() {
   FreePlatformCaches();
 }
 
 void ThemeService::Init(Profile* profile) {
   DCHECK(CalledOnValidThread());
   profile_ = profile;
 
+  // Listen to EXTENSION_LOADED instead of EXTENSION_INSTALLED because
+  // the extension cannot yet be found via GetExtensionById() if it is
+  // installed but not loaded (which may confuse listeners to
+  // BROWSER_THEME_CHANGED).
+  registrar_.Add(this,
+                 chrome::NOTIFICATION_EXTENSION_LOADED,
+                 content::Source<Profile>(profile_));
+
   LoadThemePrefs();
 
   theme_syncable_service_.reset(new ThemeSyncableService(profile_, this));
 }
 
 gfx::Image ThemeService::GetImageNamed(int id) const {
   DCHECK(CalledOnValidThread());
 
   const gfx::Image* image = NULL;
 
@@ skipping 96 matching lines @@
 
   return data;
 }
 
 void ThemeService::SetTheme(const Extension* extension) {
   // Clear our image cache.
   FreePlatformCaches();
 
   DCHECK(extension);
   DCHECK(extension->is_theme());
-  if (DCHECK_IS_ON()) {
-    ExtensionService* service =
-        extensions::ExtensionSystem::Get(profile_)->extension_service();
-    DCHECK(service);
-    DCHECK(service->GetExtensionById(extension->id(), false));
-  }
 
   BuildFromExtension(extension);
   SaveThemeID(extension->id());
 
   NotifyThemeChanged();
   content::RecordAction(UserMetricsAction("Themes_Installed"));
 }
 
 void ThemeService::RemoveUnusedThemes() {
   if (!profile_)
@@ skipping 288 matching lines @@
     theme_syncable_service_->OnThemeChange();
   }
 }
 
 #if defined(OS_WIN) || defined(USE_AURA)
 void ThemeService::FreePlatformCaches() {
   // Views (Skia) has no platform image cache to clear.
 }
 #endif
 
+void ThemeService::Observe(int type,
+                           const content::NotificationSource& source,
+                           const content::NotificationDetails& details) {
+  DCHECK(type == chrome::NOTIFICATION_EXTENSION_LOADED);
+  const Extension* extension = content::Details<const Extension>(details).ptr();
+  if (!extension->is_theme()) {
+    return;
+  }
+  SetTheme(extension);
+}
+
 void ThemeService::SavePackName(const FilePath& pack_path) {
   profile_->GetPrefs()->SetFilePath(
       prefs::kCurrentThemePackFilename, pack_path);
 }
 
 void ThemeService::SaveThemeID(const std::string& id) {
   profile_->GetPrefs()->SetString(prefs::kCurrentThemeID, id);
 }
 
 void ThemeService::BuildFromExtension(const Extension* extension) {
@@ skipping 28 matching lines @@
 void ThemeService::OnInfobarDestroyed() {
   number_of_infobars_--;
 
   if (number_of_infobars_ == 0)
     RemoveUnusedThemes();
 }
 
 ThemeSyncableService* ThemeService::GetThemeSyncableService() const {
   return theme_syncable_service_.get();
 }