Extension Settings API: throttle the API in the same way that the Bookmarks API

chrome/browser/extensions/settings/settings_api.h

Index: chrome/browser/extensions/settings/settings_api.h
diff --git a/chrome/browser/extensions/settings/settings_api.h b/chrome/browser/extensions/settings/settings_api.h
index 4f0671ff88e5c6156a3a6bc46dd3edfd01694036..9e0c712ecbee821e40900e7be4b5f4b67e33072b 100644
--- a/chrome/browser/extensions/settings/settings_api.h
+++ b/chrome/browser/extensions/settings/settings_api.h
@@ -66,6 +66,9 @@ class SetSettingsFunction : public SettingsFunction {
   virtual bool RunWithStorage(
       scoped_refptr<SettingsObserverList> observers,
       SettingsStorage* storage) OVERRIDE;
+
+  virtual void GetQuotaLimitHeuristics(
+      QuotaLimitHeuristics* heuristics) const OVERRIDE;
 };
 
 class RemoveSettingsFunction : public SettingsFunction {
@@ -76,6 +79,9 @@ class RemoveSettingsFunction : public SettingsFunction {
   virtual bool RunWithStorage(
       scoped_refptr<SettingsObserverList> observers,
       SettingsStorage* storage) OVERRIDE;
+
+  virtual void GetQuotaLimitHeuristics(
+      QuotaLimitHeuristics* heuristics) const OVERRIDE;
 };
 
 class ClearSettingsFunction : public SettingsFunction {
@@ -86,6 +92,9 @@ class ClearSettingsFunction : public SettingsFunction {
   virtual bool RunWithStorage(
       scoped_refptr<SettingsObserverList> observers,
       SettingsStorage* storage) OVERRIDE;
+
+  virtual void GetQuotaLimitHeuristics(
+      QuotaLimitHeuristics* heuristics) const OVERRIDE;
 };
 
 }  // namespace extensions