Convert CreateCdmBuffer() to use size_t for |capacity|

media/mojo/common/mojo_shared_buffer_video_frame_unittest.cc

Index: media/mojo/common/mojo_shared_buffer_video_frame_unittest.cc
diff --git a/media/mojo/common/mojo_shared_buffer_video_frame_unittest.cc b/media/mojo/common/mojo_shared_buffer_video_frame_unittest.cc
index e52f7d6112b992d22c1fe266b7b8537d4cc9bc3f..e7e4b38b3a96f3b146bf74bbc92c46d6ba1966a9 100644
--- a/media/mojo/common/mojo_shared_buffer_video_frame_unittest.cc
+++ b/media/mojo/common/mojo_shared_buffer_video_frame_unittest.cc
@@ -6,6 +6,7 @@
 
 #include <stddef.h>
 #include <stdint.h>
+
 #include <string>
 
 #include "base/memory/ref_counted.h"
@@ -21,10 +22,10 @@ namespace {
 
 void CompareDestructionCallbackValues(
     mojo::SharedBufferHandle expected_handle,
-    uint32_t expected_handle_size,
+    size_t expected_handle_size,
     bool* callback_called,
     mojo::ScopedSharedBufferHandle actual_handle,
-    uint32_t actual_handle_size) {
+    size_t actual_handle_size) {
   // Compare expected vs actual. Ownership of the memory is transferred with
   // |actual_handle|, thus it is a ScopedSharedBufferHandle.
   EXPECT_EQ(expected_handle, actual_handle.get());