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

chrome/browser/safe_browsing/safe_browsing_blocking_page_test.cc

 // 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.
 //
 // This test creates a fake safebrowsing service, where we can inject
 // malware and phishing urls.  It then uses a real browser to go to
 // these urls, and sends "goback" or "proceed" commands and verifies
 // they work.
 
 #include "base/bind.h"
@@ skipping 550 matching lines @@
 
   bool Click(const std::string& node_id) {
     content::RenderViewHost* rvh = GetRenderViewHost();
     if (!rvh)
       return false;
     // We don't use ExecuteScriptAndGetValue for this one, since clicking
     // the button/link may navigate away before the injected javascript can
     // reply, hanging the test.
     rvh->ExecuteJavascriptInWebFrame(
         base::string16(),
-        ASCIIToUTF16("document.getElementById('" + node_id + "').click();\n"));
+        base::ASCIIToUTF16(
+            "document.getElementById('" + node_id + "').click();\n"));
     return true;
   }
 
   bool ClickAndWaitForDetach(const std::string& node_id) {
     // We wait for interstitial_detached rather than nav_entry_committed, as
     // going back from a main-frame malware interstitial page will not cause a
     // nav entry committed event.
     scoped_refptr<content::MessageLoopRunner> loop_runner(
         new content::MessageLoopRunner);
     InterstitialObserver observer(
@@ skipping 293 matching lines @@
   SetupWarningAndNavigate(SB_THREAT_TYPE_URL_PHISHING);
 
   EXPECT_TRUE(ClickAndWaitForDetach("learn-more-link"));
   AssertNoInterstitial(false);  // Assert the interstitial is gone
 
   // We are in the help page.
   EXPECT_EQ(
       "/goodtoknow/online-safety/phishing/",
        browser()->tab_strip_model()->GetActiveWebContents()->GetURL().path());
 }