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

chrome/browser/ui/cocoa/web_dialog_window_controller_unittest.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/web_dialog_window_controller.h"
 
 #include <string>
 #include <vector>
 
 #import <Cocoa/Cocoa.h>
@@ skipping 32 matching lines @@
   MOCK_METHOD2(OnCloseContents,
                void(WebContents* source, bool* out_close_dialog));
   MOCK_CONST_METHOD0(ShouldShowDialogTitle, bool());
 };
 
 class WebDialogWindowControllerTest : public BrowserWithTestWindowTest {
  public:
   virtual void SetUp() {
     BrowserWithTestWindowTest::SetUp();
     CocoaTest::BootstrapCocoa();
-    title_ = ASCIIToUTF16("Mock Title");
+    title_ = base::ASCIIToUTF16("Mock Title");
     size_ = gfx::Size(50, 100);
     gurl_ = GURL("");
   }
 
  protected:
   base::string16 title_;
   gfx::Size size_;
   GURL gurl_;
 
   // Order here is important.
@@ skipping 28 matching lines @@
   WebDialogWindowController* web_dialog_window_controller =
     [[WebDialogWindowController alloc] initWithDelegate:&delegate_
                                                 context:profile()];
 
   [web_dialog_window_controller loadDialogContents];
   [web_dialog_window_controller showWindow:nil];
   [web_dialog_window_controller close];
 }
 
 }  // namespace