Made MediaFilter::host_ and MediaFilter::message_loop_ private.

media/filters/file_data_source.cc

Index: media/filters/file_data_source.cc
diff --git a/media/filters/file_data_source.cc b/media/filters/file_data_source.cc
index bdab8fb3ec534f1885b1490ca3878b47ab9b7756..2e13a59e9bcfb75515e6ae5e4cce7eb3ac595edc 100644
--- a/media/filters/file_data_source.cc
+++ b/media/filters/file_data_source.cc
@@ -32,15 +32,15 @@ bool FileDataSource::Initialize(const std::string& url) {
   }
   if (!file_) {
     file_size_ = 0;
-    host_->Error(PIPELINE_ERROR_URL_NOT_FOUND);
+    host()->Error(PIPELINE_ERROR_URL_NOT_FOUND);
     return false;
   }
   media_format_.SetAsString(MediaFormat::kMimeType,
                             mime_type::kApplicationOctetStream);
   media_format_.SetAsString(MediaFormat::kURL, url);
-  host_->SetTotalBytes(file_size_);
-  host_->SetBufferedBytes(file_size_);
-  host_->InitializationComplete();
+  host()->SetTotalBytes(file_size_);
+  host()->SetBufferedBytes(file_size_);
+  host()->InitializationComplete();
   return true;
 }