Convert CreateCdmBuffer() to use size_t for |capacity|

media/mojo/services/mojo_cdm_allocator_unittest.cc

 // Copyright 2016 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 <stddef.h>
 #include <stdint.h>
 
 #include <cstring>
 
 #include "base/macros.h"
 #include "media/base/video_frame.h"
 #include "media/cdm/api/content_decryption_module.h"
 #include "media/cdm/cdm_helpers.h"
 #include "media/mojo/services/mojo_cdm_allocator.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gfx/geometry/size.h"
 
 namespace media {
 
 class MojoCdmAllocatorTest : public testing::Test {
  public:
   MojoCdmAllocatorTest() {}
   ~MojoCdmAllocatorTest() override {}
 
  protected:
-  cdm::Buffer* CreateCdmBuffer(uint32_t capacity) {
+  cdm::Buffer* CreateCdmBuffer(size_t capacity) {
     return allocator_.CreateCdmBuffer(capacity);
   }
 
   scoped_ptr<VideoFrameImpl> CreateCdmVideoFrame() {
     return allocator_.CreateCdmVideoFrame();
   }
 
   MojoHandle GetHandle(cdm::Buffer* buffer) {
     return allocator_.GetHandleForTesting(buffer);
   }
@@ skipping 85 matching lines @@
   // Check that the buffer is still in use. It will be freed when |frame|
   // is destroyed.
   EXPECT_EQ(0u, GetAvailableBufferCount());
   frame = nullptr;
 
   // Check that the buffer is now in the free list.
   EXPECT_EQ(1u, GetAvailableBufferCount());
 }
 
 }  // namespace media