Don't use writeData to write the document in GM.

gm/gmmain.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 /*
  * Code for the "gm" (Golden Master) rendering comparison tool.
  *
@@ skipping 340 matching lines @@
         for (int typeInt = 0; typeInt <= kLast_ErrorType; typeInt++) {
             this->DisplayResultTypeSummary(static_cast<ErrorType>(typeInt), verbose);
         }
         gm_fprintf(stdout, "(results marked with [*] will cause nonzero return value)\n");
     }
 
     static bool write_document(const SkString& path,
                                const SkDynamicMemoryWStream& document) {
         SkFILEWStream stream(path.c_str());
         SkAutoDataUnref data(document.copyToData());
-        return stream.writeData(data.get());
+        return stream.write(data->data(), data->size());
     }
 
     /**
      * Prepare an SkBitmap to render a GM into.
      *
      * After you've rendered the GM into the SkBitmap, you must call
      * complete_bitmap()!
      *
      * @todo thudson 22 April 2011 - could refactor this to take in
      * a factory to generate the context, always call readPixels()
@@ skipping 1636 matching lines @@
     if (FLAGS_forceBWtext) {
         canvas->setDrawFilter(SkNEW(BWTextDrawFilter))->unref();
     }
 }
 
 #if !defined(SK_BUILD_FOR_IOS) && !defined(SK_BUILD_FOR_NACL)
 int main(int argc, char * const argv[]) {
     return tool_main(argc, (char**) argv);
 }
 #endif