win: pull gyp for gn generation

mojo/common/data_pipe_utils.cc

 // Copyright 2014 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 "mojo/common/data_pipe_utils.h"
 
 #include <stdio.h>
 
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
@@ skipping 82 matching lines @@
                     MOJO_DEADLINE_INDEFINITE);
       if (result != MOJO_RESULT_OK) {
         // If the consumer handle was closed, then treat as EOF.
         return result == MOJO_RESULT_FAILED_PRECONDITION;
       }
     } else {
       // If the consumer handle was closed, then treat as EOF.
       return result == MOJO_RESULT_FAILED_PRECONDITION;
     }
   }
+#if !defined(OS_WIN)
   NOTREACHED();
   return false;
+#endif
 }
 
 } // namespace
 
 // TODO(hansmuller): Add a max_size parameter.
 bool BlockingCopyToString(ScopedDataPipeConsumerHandle source,
                           std::string* result) {
   CHECK(result);
   result->clear();
   return BlockingCopyHelper(
@@ skipping 26 matching lines @@
                   base::TaskRunner* task_runner,
                   const base::Callback<void(bool)>& callback) {
   base::PostTaskAndReplyWithResult(task_runner, FROM_HERE,
                                    base::Bind(&BlockingCopyFromFile, source,
                                               base::Passed(&destination), skip),
                                    callback);
 }
 
 }  // namespace common
 }  // namespace mojo