Convert CreateCdmBuffer() to use size_t for |capacity|

media/cdm/simple_cdm_allocator.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 "media/cdm/simple_cdm_allocator.h"
 
 #include "media/base/video_frame.h"
 #include "media/cdm/cdm_helpers.h"
 #include "media/cdm/simple_cdm_buffer.h"
 #include "ui/gfx/geometry/rect.h"
@@ skipping 40 matching lines @@
 
 }  // namespace
 
 SimpleCdmAllocator::SimpleCdmAllocator() {}
 
 SimpleCdmAllocator::~SimpleCdmAllocator() {}
 
 // Creates a new SimpleCdmBuffer on every request. It does not keep track of
 // the memory allocated, so the caller is responsible for calling Destroy()
 // on the buffer when it is no longer needed.
-cdm::Buffer* SimpleCdmAllocator::CreateCdmBuffer(uint32_t capacity) {
+cdm::Buffer* SimpleCdmAllocator::CreateCdmBuffer(size_t capacity) {
   if (!capacity)
     return nullptr;
 
   return SimpleCdmBuffer::Create(capacity);
 }
 
 // Creates a new SimpleCdmVideoFrame on every request.
 scoped_ptr<VideoFrameImpl> SimpleCdmAllocator::CreateCdmVideoFrame() {
   return make_scoped_ptr(new SimpleCdmVideoFrame());
 }
 
 }  // namespace media