Change ChunkDemuxerStream/SourceBufferStream memory limit to size_t type

media/filters/source_buffer_platform.cc

Index: media/filters/source_buffer_platform.cc
diff --git a/media/filters/source_buffer_platform.cc b/media/filters/source_buffer_platform.cc
index 6457e8cca0c4c83efefb1599c6d3d575eb2035f7..89761a126045ebc6434d8d2fba79a83abbe40a37 100644
--- a/media/filters/source_buffer_platform.cc
+++ b/media/filters/source_buffer_platform.cc
@@ -8,7 +8,7 @@ namespace media {
 
 // 12MB: approximately 5 minutes of 320Kbps content.
 // 150MB: approximately 5 minutes of 4Mbps content.
-const int kSourceBufferAudioMemoryLimit = 12 * 1024 * 1024;
-const int kSourceBufferVideoMemoryLimit = 150 * 1024 * 1024;
+const size_t kSourceBufferAudioMemoryLimit = 12 * 1024 * 1024;
+const size_t kSourceBufferVideoMemoryLimit = 150 * 1024 * 1024;
 
 }  // namespace media