Update some uses of char16 to use the base:: namespace.

chrome/browser/autocomplete/search_provider_unittest.cc

 // Copyright 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/search_provider.h"
 
 #include <string>
 
 #include "base/command_line.h"
 #include "base/metrics/field_trial.h"
@@ skipping 548 matching lines @@
 
   // The SearchProvider is done. Make sure it has a result for the history
   // term keyword.
   AutocompleteMatch match;
   EXPECT_TRUE(FindMatchWithDestination(keyword_url_, &match));
 
   // The match should have an associated keyword.
   EXPECT_FALSE(match.keyword.empty());
 
   // The fill into edit should contain the keyword.
-  EXPECT_EQ(keyword_t_url_->keyword() + char16(' ') + keyword_term_,
+  EXPECT_EQ(keyword_t_url_->keyword() + base::char16(' ') + keyword_term_,
             match.fill_into_edit);
 }
 
 TEST_F(SearchProviderTest, DontSendPrivateDataToSuggest) {
   // None of the following input strings should be sent to the suggest server,
   // because they may contain private data.
   const char* inputs[] = {
     "username:password",
     "http://username:password",
     "https://username:password",
@@ skipping 3450 matching lines @@
   EXPECT_FALSE(provider_->deletion_handlers_.empty());
   // Set up a default fetcher with provided results.
   fetcher = test_factory_.GetFetcherByID(
       SearchProvider::kDeletionURLFetcherID);
   ASSERT_TRUE(fetcher);
   fetcher->set_response_code(500);
   fetcher->delegate()->OnURLFetchComplete(fetcher);
   EXPECT_TRUE(provider_->deletion_handlers_.empty());
   EXPECT_FALSE(provider_->is_success());
 }