Add base:: to string16s in android_webview/.

android_webview/native/aw_contents_client_bridge.h

Index: android_webview/native/aw_contents_client_bridge.h
diff --git a/android_webview/native/aw_contents_client_bridge.h b/android_webview/native/aw_contents_client_bridge.h
index fcb82d515b6eccc24fdb9973851b43bed95bb626..4cd6c6caa130d8c18dbaac68fe876996bad320f1 100644
--- a/android_webview/native/aw_contents_client_bridge.h
+++ b/android_webview/native/aw_contents_client_bridge.h
@@ -43,13 +43,13 @@ class AwContentsClientBridge : public AwContentsClientBridgeBase {
   virtual void RunJavaScriptDialog(
       content::JavaScriptMessageType message_type,
       const GURL& origin_url,
-      const string16& message_text,
-      const string16& default_prompt_text,
+      const base::string16& message_text,
+      const base::string16& default_prompt_text,
       const content::JavaScriptDialogManager::DialogClosedCallback& callback)
       OVERRIDE;
   virtual void RunBeforeUnloadDialog(
       const GURL& origin_url,
-      const string16& message_text,
+      const base::string16& message_text,
       const content::JavaScriptDialogManager::DialogClosedCallback& callback)
       OVERRIDE;
   virtual bool ShouldOverrideUrlLoading(const base::string16& url) OVERRIDE;