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

chrome/browser/ui/blocked_content/popup_blocker_browsertest.cc

 // Copyright 2013 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/command_line.h"
 #include "base/files/file_path.h"
 #include "base/message_loop/message_loop.h"
 #include "base/path_service.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/autocomplete/autocomplete_match.h"
@@ skipping 314 matching lines @@
   ASSERT_EQ(GURL(search_string), history_urls[0]);
   ASSERT_EQ(url, history_urls[1]);
 
   TemplateURLService* service = TemplateURLServiceFactory::GetForProfile(
       browser()->profile());
   ui_test_utils::WaitForTemplateURLServiceToLoad(service);
   LocationBar* location_bar = browser()->window()->GetLocationBar();
   ui_test_utils::SendToOmniboxAndSubmit(location_bar, search_string);
   OmniboxEditModel* model = location_bar->GetOmniboxView()->model();
   EXPECT_EQ(GURL(search_string), model->CurrentMatch(NULL).destination_url);
-  EXPECT_EQ(ASCIIToUTF16(search_string), model->CurrentMatch(NULL).contents);
+  EXPECT_EQ(base::ASCIIToUTF16(search_string),
+            model->CurrentMatch(NULL).contents);
 }
 
 // This test fails on linux AURA with this change
 // https://codereview.chromium.org/23903056
 // BUG=https://code.google.com/p/chromium/issues/detail?id=295299
 // TODO(ananta). Debug and fix this test.
 #if defined(USE_AURA) && defined(OS_LINUX)
 #define MAYBE_WindowFeatures DISABLED_WindowFeatures
 #else
 #define MAYBE_WindowFeatures WindowFeatures
@@ skipping 69 matching lines @@
 // popups.
 IN_PROC_BROWSER_TEST_F(PopupBlockerBrowserTest, DenialOfService) {
   GURL url(ui_test_utils::GetTestUrl(
       base::FilePath(kTestDir),
       base::FilePath(FILE_PATH_LITERAL("popup-dos.html"))));
   ui_test_utils::NavigateToURL(browser(), url);
   ASSERT_EQ(25, GetBlockedContentsCount());
 }
 
 }  // namespace