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

chrome/browser/ui/cocoa/website_settings_bubble_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/website_settings_bubble_controller.h"
 
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/ui/cocoa/cocoa_test_helper.h"
 #include "testing/gtest_mac.h"
 
@@ skipping 300 matching lines @@
   EXPECT_NSNE([controller_ helpButton], [buttons objectAtIndex:1]);
 
   // Check that it has a target and action linked up.
   link_button = static_cast<NSButton*>([buttons objectAtIndex:1]);
   EXPECT_NSEQ(controller_, [link_button target]);
   EXPECT_TRUE([link_button action] == @selector(showCertificateInfo:));
 }
 
 TEST_F(WebsiteSettingsBubbleControllerTest, SetFirstVisit) {
   CreateBubble();
-  bridge_->SetFirstVisit(ASCIIToUTF16("Yesterday"));
+  bridge_->SetFirstVisit(base::ASCIIToUTF16("Yesterday"));
   EXPECT_NSEQ(@"Yesterday",
               [[controller_ firstVisitDescriptionField] stringValue]);
 }
 
 TEST_F(WebsiteSettingsBubbleControllerTest, SetPermissionInfo) {
   CreateBubble();
   SetTestPermissions();
 
   // There should be three subviews per permission (an icon, a label and a
   // select box), plus a text label for the Permission section.
@@ skipping 59 matching lines @@
   // popup buttons.
   for (NSView* view in [[controller_ permissionsView] subviews]) {
     if ([view isKindOfClass:[NSPopUpButton class]]) {
       NSPopUpButton* button = static_cast<NSPopUpButton*>(view);
       EXPECT_LT(NSMaxX([button frame]), window_width);
     }
   }
 }
 
 }  // namespace