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

chrome/browser/ui/cocoa/omnibox/omnibox_view_mac_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/omnibox/omnibox_view_mac.h"
 
 #include "chrome/browser/ui/cocoa/cocoa_profile_test.h"
 #include "chrome/browser/ui/omnibox/omnibox_edit_controller.h"
 #include "chrome/browser/ui/omnibox/omnibox_popup_model.h"
 #include "chrome/browser/ui/omnibox/omnibox_popup_view.h"
@@ skipping 141 matching lines @@
   OmniboxViewMac view(&controller, profile(), NULL, field.get());
 
   // This is deleted by the omnibox view.
   MockOmniboxEditModel* model =
       new MockOmniboxEditModel(&view, &controller, profile());
   SetModel(&view, model);
 
   MockOmniboxPopupView popup_view;
   OmniboxPopupModel popup_model(&popup_view, model);
 
-  view.SetUserText(ASCIIToUTF16("Alfred"));
-  EXPECT_EQ("Alfred", UTF16ToUTF8(view.GetText()));
-  view.SetGrayTextAutocompletion(ASCIIToUTF16(" Hitchcock"));
-  EXPECT_EQ("Alfred", UTF16ToUTF8(view.GetText()));
-  EXPECT_EQ(" Hitchcock", UTF16ToUTF8(view.GetGrayTextAutocompletion()));
+  view.SetUserText(base::ASCIIToUTF16("Alfred"));
+  EXPECT_EQ("Alfred", base::UTF16ToUTF8(view.GetText()));
+  view.SetGrayTextAutocompletion(base::ASCIIToUTF16(" Hitchcock"));
+  EXPECT_EQ("Alfred", base::UTF16ToUTF8(view.GetText()));
+  EXPECT_EQ(" Hitchcock", base::UTF16ToUTF8(view.GetGrayTextAutocompletion()));
 
   view.SetUserText(base::string16());
   EXPECT_EQ(base::string16(), view.GetText());
   EXPECT_EQ(base::string16(), view.GetGrayTextAutocompletion());
 }
 
 TEST_F(OmniboxViewMacTest, UpDownArrow) {
   OmniboxViewMac view(NULL, profile(), NULL, NULL);
 
   // This is deleted by the omnibox view.
@@ skipping 15 matching lines @@
 
   // With popup open verify that pressing up and down arrow works.
   popup_view.set_is_open(true);
   model->set_up_or_down_count(0);
   view.OnDoCommandBySelector(@selector(moveDown:));
   EXPECT_EQ(1, model->up_or_down_count());
   model->set_up_or_down_count(0);
   view.OnDoCommandBySelector(@selector(moveUp:));
   EXPECT_EQ(-1, model->up_or_down_count());
 }