Convert string16 to base::string16 in content.

content/shell/common/webkit_test_helpers.cc

 // 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.
 
 #include "content/shell/common/webkit_test_helpers.h"
 
 #include "base/command_line.h"
 #include "base/file_util.h"
 #include "base/path_service.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 53 matching lines @@
 #else
   prefs->editing_behavior = webkit_glue::EDITING_BEHAVIOR_WIN;
 #endif
   prefs->java_enabled = false;
   prefs->application_cache_enabled = true;
   prefs->tabs_to_links = false;
   prefs->hyperlink_auditing_enabled = false;
   prefs->allow_displaying_insecure_content = true;
   prefs->allow_running_insecure_content = true;
   prefs->webgl_errors_to_console_enabled = false;
-  string16 serif;
+  base::string16 serif;
 #if defined(OS_MACOSX)
   prefs->cursive_font_family_map[webkit_glue::kCommonScript] =
       ASCIIToUTF16("Apple Chancery");
   prefs->fantasy_font_family_map[webkit_glue::kCommonScript] =
       ASCIIToUTF16("Papyrus");
   serif = ASCIIToUTF16("Times");
 #else
   prefs->cursive_font_family_map[webkit_glue::kCommonScript] =
       ASCIIToUTF16("Comic Sans MS");
   prefs->fantasy_font_family_map[webkit_glue::kCommonScript] =
@@ skipping 26 matching lines @@
   prefs->viewport_enabled = false;
 }
 
 base::FilePath GetWebKitRootDirFilePath() {
   base::FilePath base_path;
   PathService::Get(base::DIR_SOURCE_ROOT, &base_path);
   return base_path.Append(FILE_PATH_LITERAL("third_party/WebKit"));
 }
 
 }  // namespace content