Add a class to replace ImageLoadingTracker with a nicer API.

chrome/browser/extensions/extension_system.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/extensions/extension_system.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/file_path.h"
 #include "base/string_tokenizer.h"
@@ skipping 74 matching lines @@
       profile_->GetPath().AppendASCII(ExtensionService::kInstallDirectoryName),
       ExtensionPrefValueMapFactory::GetForProfile(profile_)));
   extension_prefs_->Init(extensions_disabled);
 
   state_store_.reset(new StateStore(
       profile_,
       profile_->GetPath().AppendASCII(ExtensionService::kStateStoreName)));
 
   shell_window_geometry_cache_.reset(new ShellWindowGeometryCache(
     profile_, state_store_.get()));
-
 }
 
 void ExtensionSystemImpl::Shared::RegisterManagementPolicyProviders() {
   DCHECK(extension_prefs_.get());
   management_policy_->RegisterProvider(extension_prefs_.get());
 }
 
 void ExtensionSystemImpl::Shared::Init(bool extensions_enabled) {
   const CommandLine* command_line = CommandLine::ForCurrentProcess();
 
@@ skipping 288 matching lines @@
 void ExtensionSystemImpl::UnregisterExtensionWithRequestContexts(
     const std::string& extension_id,
     const extension_misc::UnloadedExtensionReason reason) {
   BrowserThread::PostTask(
       BrowserThread::IO, FROM_HERE,
       base::Bind(&ExtensionInfoMap::RemoveExtension, info_map(),
                  extension_id, reason));
 }
 
 }  // namespace extensions