Fix some memory leaks in GPU tests.

gpu/command_buffer/client/cmd_buffer_helper_test.cc

 // Copyright (c) 2009 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.
 
 // Tests for the Command Buffer Helper.
 
 #include "base/at_exit.h"
 #include "base/callback.h"
 #include "base/message_loop.h"
 #include "base/scoped_nsautorelease_pool.h"
@@ skipping 47 matching lines @@
 
     api_mock_->set_engine(gpu_processor_.get());
 
     helper_.reset(new CommandBufferHelper(command_buffer_.get()));
     helper_->Initialize();
   }
 
   virtual void TearDown() {
     // If the GPUProcessor posts any tasks, this forces them to run.
     MessageLoop::current()->RunAllPending();
-    helper_.release();
   }
 
   // Adds a command to the buffer through the helper, while adding it as an
   // expected call on the API mock.
   void AddCommandWithExpect(error::Error _return,
                             unsigned int command,
                             int arg_count,
                             CommandBufferEntry *args) {
     CommandHeader header;
     header.size = arg_count + 1;
@@ skipping 196 matching lines @@
   helper_->Finish();
 
   // Check that the commands did happen.
   Mock::VerifyAndClearExpectations(api_mock_.get());
 
   // Check the error status.
   EXPECT_EQ(error::kNoError, GetError());
 }
 
 }  // namespace gpu