Only apply extension throttling quota to sync, not local.

chrome/browser/extensions/settings/settings_api.h

 // 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.
 
 #ifndef CHROME_BROWSER_EXTENSIONS_SETTINGS_SETTINGS_API_H_
 #define CHROME_BROWSER_EXTENSIONS_SETTINGS_SETTINGS_API_H_
 #pragma once
 
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
 #include "chrome/browser/extensions/extension_function.h"
 #include "chrome/browser/extensions/settings/settings_backend.h"
 #include "chrome/browser/extensions/settings/settings_namespace.h"
 #include "chrome/browser/extensions/settings/settings_storage.h"
 
 namespace extensions {
 
 // Superclass of all settings functions.
 //
 // NOTE: these all have "*SettingsFunction" names left over from when the API
 // was called the "Settings API" (now "Storage API").
 // TODO(kalman): Rename these functions, and all files under
 // chrome/browser/extensions/settings.
 class SettingsFunction : public AsyncExtensionFunction {
  public:
   SettingsFunction();
   virtual ~SettingsFunction();
 
  protected:
+  virtual bool ShouldSkipQuotaLimiting() const OVERRIDE;
+
   virtual bool RunImpl() OVERRIDE;
 
   // Extension settings function implementations should do their work here.
   // This runs on the FILE thread.
   //
   // Implementations should fill in args themselves, though (like RunImpl)
   // may return false to imply failure.
   virtual bool RunWithStorage(SettingsStorage* storage) = 0;
 
   // Sets error_ or result_ depending on the value of a storage ReadResult, and
@@ skipping 63 matching lines @@
  public:
   DECLARE_EXTENSION_FUNCTION_NAME("storage.getBytesInUse");
 
  protected:
   virtual bool RunWithStorage(SettingsStorage* storage) OVERRIDE;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_SETTINGS_SETTINGS_API_H_