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

content/browser/fileapi/file_system_dir_url_request_job_unittest.cc

Index: content/browser/fileapi/file_system_dir_url_request_job_unittest.cc
diff --git a/content/browser/fileapi/file_system_dir_url_request_job_unittest.cc b/content/browser/fileapi/file_system_dir_url_request_job_unittest.cc
index 874e61b0203c265054d30d08aeef002f98943236..dd7a536b8f84c756b89b37e25df9c69e6619cf41 100644
--- a/content/browser/fileapi/file_system_dir_url_request_job_unittest.cc
+++ b/content/browser/fileapi/file_system_dir_url_request_job_unittest.cc
@@ -180,7 +180,7 @@ class FileSystemDirURLRequestJobTest : public testing::Test {
     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());
   }