Android WebView: post QuotaManager calls to UI thread.

android_webview/browser/aw_quota_manager_bridge.h

Index: android_webview/browser/aw_quota_manager_bridge.h
diff --git a/android_webview/browser/aw_quota_manager_bridge.h b/android_webview/browser/aw_quota_manager_bridge.h
index 5480cf824ac7364c9668a7dedf874ac172ac18bc..bc4da37825c4b532aefb79a131410fb00766e6a0 100644
--- a/android_webview/browser/aw_quota_manager_bridge.h
+++ b/android_webview/browser/aw_quota_manager_bridge.h
@@ -5,11 +5,16 @@
 #ifndef ANDROID_WEBVIEW_BROWSER_AW_QUOTA_MANAGER_BRIDGE_H_
 #define ANDROID_WEBVIEW_BROWSER_AW_QUOTA_MANAGER_BRIDGE_H_
 
+#include "base/memory/ref_counted.h"
+
 namespace android_webview {
 
-// Empty base class so this can be owned and destroyed by AwBrowserContext.
-class AwQuotaManagerBridge {
- public:
+// Empty base class so this can be refcounted by AwBrowserContext.
+class AwQuotaManagerBridge :
+    public base::RefCountedThreadSafe<AwQuotaManagerBridge> {
+ protected:
+  friend class base::RefCountedThreadSafe<AwQuotaManagerBridge>;
+  AwQuotaManagerBridge();
   virtual ~AwQuotaManagerBridge();
 };