Change the type for byte counts to size_t in WebMediaPlayer

content/renderer/media/html_video_element_capturer_source_unittest.cc

Index: content/renderer/media/html_video_element_capturer_source_unittest.cc
diff --git a/content/renderer/media/html_video_element_capturer_source_unittest.cc b/content/renderer/media/html_video_element_capturer_source_unittest.cc
index af949ecf62df99d45367f70b180d6c5447ea78a9..fb8f502f46098a9cd50ae48c55e5c9103615ad56 100644
--- a/content/renderer/media/html_video_element_capturer_source_unittest.cc
+++ b/content/renderer/media/html_video_element_capturer_source_unittest.cc
@@ -67,8 +67,8 @@ class MockWebMediaPlayer : public blink::WebMediaPlayer,
   unsigned decodedFrameCount() const override { return 0; }
   unsigned droppedFrameCount() const override { return 0; }
   unsigned corruptedFrameCount() const override { return 0; }
-  unsigned audioDecodedByteCount() const override { return 0; }
-  unsigned videoDecodedByteCount() const override { return 0; }
+  size_t audioDecodedByteCount() const override { return 0; }
+  size_t videoDecodedByteCount() const override { return 0; }
 
   void paint(blink::WebCanvas* canvas,
              const blink::WebRect& paint_rectangle,