Implement FeatureProvider for ExtensionAPI.

chrome/browser/extensions/settings/settings_frontend.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/settings/settings_frontend.h"
 
 #include "base/bind.h"
 #include "base/file_path.h"
 #include "base/string_number_conversions.h"
 #include "chrome/browser/extensions/extension_event_names.h"
@@ skipping 88 matching lines @@
   CHECK(base::StringToSizeT(as_string, &as_integer));
   return as_integer;
 }
 
 // Constructs a |Limits| configuration by looking up the QUOTA_BYTES,
 // QUOTA_BYTES_PER_ITEM, and MAX_ITEMS properties of a storage area defined
 // in chrome/common/extensions/api/storage.json (via ExtensionAPI).
 SettingsStorageQuotaEnforcer::Limits GetLimitsFromExtensionAPI(
     const std::string& storage_area_id) {
   const DictionaryValue* storage_schema =
-      ExtensionAPI::GetInstance()->GetSchema("storage");
+      ExtensionAPI::GetSharedInstance()->GetSchema("storage");
   CHECK(storage_schema);
 
   DictionaryValue* properties = NULL;
   storage_schema->GetDictionary(
       "properties." + storage_area_id + ".properties", &properties);
   CHECK(properties);
 
   SettingsStorageQuotaEnforcer::Limits limits = {
     GetStringAsInteger(*properties, "QUOTA_BYTES.value", UINT_MAX),
     GetStringAsInteger(*properties, "QUOTA_BYTES_PER_ITEM.value", UINT_MAX),
@@ skipping 231 matching lines @@
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
   return observers_;
 }
 
 // BackendWrappers
 
 SettingsFrontend::BackendWrappers::BackendWrappers() {}
 SettingsFrontend::BackendWrappers::~BackendWrappers() {}
 
 }  // namespace extensions