Add base:: to string16s in android_webview/.

android_webview/browser/aw_javascript_dialog_manager.h

Index: android_webview/browser/aw_javascript_dialog_manager.h
diff --git a/android_webview/browser/aw_javascript_dialog_manager.h b/android_webview/browser/aw_javascript_dialog_manager.h
index f8db746edc35c2d48bf4c0f297644ca17b282050..e43932dd71bd9516bba8beb07cac7b38d1b6450d 100644
--- a/android_webview/browser/aw_javascript_dialog_manager.h
+++ b/android_webview/browser/aw_javascript_dialog_manager.h
@@ -20,13 +20,13 @@ class AwJavaScriptDialogManager : public content::JavaScriptDialogManager {
       const GURL& origin_url,
       const std::string& accept_lang,
       content::JavaScriptMessageType message_type,
-      const string16& message_text,
-      const string16& default_prompt_text,
+      const base::string16& message_text,
+      const base::string16& default_prompt_text,
       const DialogClosedCallback& callback,
       bool* did_suppress_message) OVERRIDE;
   virtual void RunBeforeUnloadDialog(
       content::WebContents* web_contents,
-      const string16& message_text,
+      const base::string16& message_text,
       bool is_reload,
       const DialogClosedCallback& callback) OVERRIDE;
   virtual void CancelActiveAndPendingDialogs(