Update some uses of UTF conversions in chrome/browser to use the base:: namespace.

chrome/browser/ui/cocoa/browser_window_controller_browsertest.mm

 // 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.
 
 #import "chrome/browser/ui/cocoa/browser_window_controller.h"
 
 #import "base/mac/mac_util.h"
 #include "base/run_loop.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/browser_process.h"
@@ skipping 172 matching lines @@
 
   // Create a profile asynchronously and run the loop until its creation
   // is complete.
   base::RunLoop run_loop;
 
   ProfileManager::CreateCallback create_callback =
       base::Bind(&CreateProfileCallback, run_loop.QuitClosure());
   profile_manager->CreateProfileAsync(
       profile_manager->user_data_dir().Append("test"),
       create_callback,
-      ASCIIToUTF16("avatar_test"),
+      base::ASCIIToUTF16("avatar_test"),
       base::string16(),
       std::string());
 
   run_loop.Run();
 
   // There should now be two profiles, and the avatar button and fullscreen
   // button are both visible.
   EXPECT_EQ(2u, profile_manager->GetNumberOfProfiles());
   EXPECT_FALSE([avatar isHidden]);
   EXPECT_FALSE([fullscreen_button isHidden]);
@@ skipping 174 matching lines @@
                        StatusBubblePositioning) {
   NSPoint origin = [controller() statusBubbleBaseFrame].origin;
 
   DevToolsWindow* devtools_window = DevToolsWindow::ToggleDevToolsWindow(
       browser(), DevToolsToggleAction::Show());
   SetDevToolsWindowContentsInsets(devtools_window, 10, 10, 10, 10);
 
   NSPoint originWithDevTools = [controller() statusBubbleBaseFrame].origin;
   EXPECT_FALSE(NSEqualPoints(origin, originWithDevTools));
 }