Update uses of UTF conversions in content/ to use the base:: namespace.

content/browser/fileapi/file_system_dir_url_request_job_unittest.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 "webkit/browser/fileapi/file_system_dir_url_request_job.h"
 
 #include <string>
 
 #include "base/files/file_path.h"
 #include "base/files/scoped_temp_dir.h"
@@ skipping 162 matching lines @@
     EXPECT_EQ(icu::UnicodeString(name.c_str()), match.group(1, status));
     EXPECT_EQ(icu::UnicodeString(url.c_str()), match.group(2, status));
     EXPECT_EQ(icu::UnicodeString(is_directory ? "1" : "0"),
               match.group(3, status));
     icu::UnicodeString size_string(FormatBytesUnlocalized(size).c_str());
     EXPECT_EQ(size_string, match.group(4, status));
 
     base::Time date;
     icu::UnicodeString date_ustr(match.group(5, status));
     std::string date_str;
-    UTF16ToUTF8(date_ustr.getBuffer(), date_ustr.length(), &date_str);
+    base::UTF16ToUTF8(date_ustr.getBuffer(), date_ustr.length(), &date_str);
     EXPECT_TRUE(base::Time::FromString(date_str.c_str(), &date));
     EXPECT_FALSE(date.is_null());
   }
 
   GURL CreateFileSystemURL(const std::string path) {
     return GURL(kFileSystemURLPrefix + path);
   }
 
   static net::URLRequestJob* FileSystemDirURLRequestJobFactory(
       net::URLRequest* request,
@@ skipping 118 matching lines @@
 
   TestRequestWithContext(CreateFileSystemURL("foo"),
                          file_system_context.get());
   ASSERT_FALSE(request_->is_pending());
   ASSERT_FALSE(request_->status().is_success());
   EXPECT_EQ(net::ERR_FILE_NOT_FOUND, request_->status().error());
 }
 
 }  // namespace (anonymous)
 }  // namespace fileapi