Add CdmFileIOProvider interface for use by cdm_adapter

media/cdm/cdm_file_io_provider.cc

Index: media/cdm/cdm_file_io_provider.cc
diff --git a/media/cdm/cdm_allocator.cc b/media/cdm/cdm_file_io_provider.cc
similarity index 61%
copy from media/cdm/cdm_allocator.cc
copy to media/cdm/cdm_file_io_provider.cc
index 52e722c35f1ed39e26452b6fca184eec0d83967f..00173446991b0ba25e24d3558ed3bbeeefb303ec 100644
--- a/media/cdm/cdm_allocator.cc
+++ b/media/cdm/cdm_file_io_provider.cc
@@ -2,12 +2,12 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "media/cdm/cdm_allocator.h"
+#include "media/cdm/cdm_file_io_provider.h"
 
 namespace media {
 
-CdmAllocator::CdmAllocator() {}
+CdmFileIOProvider::CdmFileIOProvider() {}
 
-CdmAllocator::~CdmAllocator() {}
+CdmFileIOProvider::~CdmFileIOProvider() {}
 
 }  // namespace media