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

chrome/browser/autocomplete/extension_app_provider.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/extension_app_provider.h"
 
 #include <algorithm>
 #include <cmath>
 
 #include "base/strings/string16.h"
@@ skipping 155 matching lines @@
 
     if (profile_->IsOffTheRecord() &&
         !extension_util::CanLoadInIncognito(app, extension_service))
       continue;
 
     GURL launch_url = app->is_platform_app() ?
         app->url() : extensions::AppLaunchInfo::GetFullLaunchURL(app);
     DCHECK(launch_url.is_valid());
 
     ExtensionApp extension_app = {
-        UTF8ToUTF16(app->name()),
-        UTF8ToUTF16(launch_url.spec()),
+        base::UTF8ToUTF16(app->name()),
+        base::UTF8ToUTF16(launch_url.spec()),
         // Only hosted apps have recognizable URLs that users might type in,
         // packaged apps and hosted apps use chrome-extension:// URLs that are
         // normally not shown to users.
         app->is_hosted_app()
     };
     extension_apps_.push_back(extension_app);
   }
 }
 
 void ExtensionAppProvider::Observe(int type,
@@ skipping 31 matching lines @@
     history::URLRow info;
     url_db->GetRowForURL(url, &info);
     type_count_boost =
         400 * (1.0 - (std::pow(static_cast<double>(2), -info.typed_count())));
   }
   int relevance = 575 + static_cast<int>(type_count_boost) +
                         static_cast<int>(fraction_boost);
   DCHECK_LE(relevance, kMaxRelevance);
   return relevance;
 }