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

chrome/browser/autocomplete/contact_provider_chromeos_unittest.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.
 
 #include "chrome/browser/autocomplete/contact_provider_chromeos.h"
 
 #include <cmath>
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 47 matching lines @@
     ASSERT_TRUE(profile_manager_->SetUp());
     profile_ = profile_manager_->CreateTestingProfile("test_profile");
     contact_manager_.reset(new contacts::ContactManagerStub(profile_));
     contact_provider_ =
         new ContactProvider(NULL, profile_, contact_manager_->GetWeakPtr());
   }
 
   // Starts a (synchronous) query for |utf8_text| in |contact_provider_|.
   void StartQuery(const std::string& utf8_text) {
     contact_provider_->Start(
-        AutocompleteInput(UTF8ToUTF16(utf8_text),
+        AutocompleteInput(base::UTF8ToUTF16(utf8_text),
                           base::string16::npos,
                           base::string16(),
                           GURL(),
                           AutocompleteInput::INVALID_SPEC,
                           false,
                           false,
                           false,
                           AutocompleteInput::ALL_MATCHES),
         false);  // minimal_changes
   }
@@ skipping 195 matching lines @@
         << "Expected contact ID " << exp_contact.contact_id()
         << " for match " << i << " but got " << match_id << " instead";
     if (i > 0) {
       EXPECT_LE(matches[i].relevance, previous_relevance)
           << "Match " << i << " has greater relevance than previous match";
     }
     EXPECT_FALSE(matches[i].allowed_to_be_default_match);
     previous_relevance = matches[i].relevance;
   }
 }