Change ChunkDemuxerStream/SourceBufferStream memory limit to size_t type

media/filters/source_buffer_stream.h

Index: media/filters/source_buffer_stream.h
diff --git a/media/filters/source_buffer_stream.h b/media/filters/source_buffer_stream.h
index afef6f74202dc025ad202083a4a2dcca842c3d22..6c43f6ed421dbe39b7d9e92baa97ea3327dbf423 100644
--- a/media/filters/source_buffer_stream.h
+++ b/media/filters/source_buffer_stream.h
@@ -142,9 +142,7 @@ class MEDIA_EXPORT SourceBufferStream {
   // yet.
   base::TimeDelta GetMaxInterbufferDistance() const;
 
-  void set_memory_limit(int memory_limit) {
-    memory_limit_ = memory_limit;
-  }
+  void SetMemoryLimit(size_t memory_limit);
 
  private:
   friend class SourceBufferStreamTest;
@@ -396,7 +394,7 @@ class MEDIA_EXPORT SourceBufferStream {
   base::TimeDelta max_interbuffer_distance_;
 
   // The maximum amount of data in bytes the stream will keep in memory.
-  int memory_limit_;
+  size_t memory_limit_;
 
   // Indicates that a kConfigChanged status has been reported by GetNextBuffer()
   // and GetCurrentXXXDecoderConfig() must be called to update the current