Add base:: to string16s in android_webview/.

android_webview/common/aw_hit_test_data.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 ANDROID_WEBVIEW_COMMON_AW_HIT_TEST_DATA_H_
 #define ANDROID_WEBVIEW_COMMON_AW_HIT_TEST_DATA_H_
 
 #include "base/strings/string16.h"
 #include "url/gurl.h"
 
@@ skipping 48 matching lines @@
     SRC_IMAGE_LINK_TYPE = 8,
 
     // Hit on an editable text input element. All other values will be empty.
     EDIT_TEXT_TYPE = 9,
   };
 
   // For all strings/GURLs, empty/invalid will become null upon conversion to
   // Java.
   int type;  // Only values from enum Type above.
   std::string extra_data_for_type;
-  string16 href;
-  string16 anchor_text;
+  base::string16 href;
+  base::string16 anchor_text;
   GURL img_src;
 
   AwHitTestData();
   ~AwHitTestData();
 };
 
 }  // namespace android_webview
 
 #endif  // ANDROID_WEBVIEW_COMMON_AW_HIT_TEST_DATA_H_