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

chrome/browser/ui/cocoa/notifications/balloon_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.
 
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/notifications/balloon.h"
 #include "chrome/browser/notifications/balloon_collection.h"
 #include "chrome/browser/notifications/notification.h"
 #include "chrome/browser/notifications/notification_object_proxy.h"
@@ skipping 61 matching lines @@
     ChromeRenderViewHostTestHarness::TearDown();
   }
 
  protected:
   scoped_ptr<Browser> browser_;
   scoped_ptr<BalloonCollection> collection_;
 };
 
 TEST_F(BalloonControllerTest, ShowAndCloseTest) {
   Notification n(GURL("http://www.google.com"), GURL("http://www.google.com"),
-      ASCIIToUTF16("http://www.google.com"), base::string16(),
+      base::ASCIIToUTF16("http://www.google.com"), base::string16(),
       new NotificationObjectProxy(-1, -1, -1, false));
   scoped_ptr<Balloon> balloon(
       new Balloon(n, profile(), collection_.get()));
   balloon->SetPosition(gfx::Point(1, 1), false);
   balloon->set_content_size(gfx::Size(100, 100));
 
   BalloonController* controller =
       [[TestBalloonController alloc] initWithBalloon:balloon.get()];
 
   [controller showWindow:nil];
   [controller closeBalloon:YES];
 }
 
 TEST_F(BalloonControllerTest, SizesTest) {
   Notification n(GURL("http://www.google.com"), GURL("http://www.google.com"),
-      ASCIIToUTF16("http://www.google.com"), base::string16(),
+      base::ASCIIToUTF16("http://www.google.com"), base::string16(),
       new NotificationObjectProxy(-1, -1, -1, false));
   scoped_ptr<Balloon> balloon(
       new Balloon(n, profile(), collection_.get()));
   balloon->SetPosition(gfx::Point(1, 1), false);
   balloon->set_content_size(gfx::Size(100, 100));
 
   BalloonController* controller =
       [[TestBalloonController alloc] initWithBalloon:balloon.get()];
 
   [controller showWindow:nil];
 
   EXPECT_TRUE([controller desiredTotalWidth] > 100);
   EXPECT_TRUE([controller desiredTotalHeight] > 100);
 
   [controller closeBalloon:YES];
 }
 
 }