base: Get rid of 'using' declaration of StringAppendF.

chrome/common/sandbox_mac.mm

 // Copyright (c) 2010 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/common/sandbox_mac.h"
 
 #include "base/debug_util.h"
 
 #import <Cocoa/Cocoa.h>
 extern "C" {
@@ skipping 76 matching lines @@
     if (c < 128) {  // EscapeSingleChar only handles ASCII.
       char as_char = static_cast<char>(c);
       if (EscapeSingleChar(as_char, dst)) {
         continue;
       }
     }
 
     if (c < 32 || c > 126) {
       // Any characters that aren't printable ASCII get the \u treatment.
       unsigned int as_uint = static_cast<unsigned int>(c);
-      StringAppendF(dst, "\\u%04X", as_uint);
+      base::StringAppendF(dst, "\\u%04X", as_uint);
       continue;
     }
 
     // If we got here we know that the character in question is strictly
     // in the ASCII range so there's no need to do any kind of encoding
     // conversion.
     dst->push_back(static_cast<char>(c));
   }
   return true;
 }
@@ skipping 430 matching lines @@
   if (HANDLE_EINTR(fcntl(fd, F_GETPATH, canonical_path)) != 0) {
     PLOG(FATAL) << "GetCanonicalSandboxPath() failed for: "
                 << path->value();
     return;
   }
 
   *path = FilePath(canonical_path);
 }
 
 }  // namespace sandbox