Revert 118546 because it caused PrerenderHTML5VideoNetwork to timeout on windows and linux

webkit/media/buffered_data_source.cc

Index: webkit/media/buffered_data_source.cc
===================================================================
--- webkit/media/buffered_data_source.cc	(revision 118589)
+++ webkit/media/buffered_data_source.cc	(working copy)
@@ -552,10 +552,11 @@
     // before. Update the total size so Read()s past the end of the file will
     // fail like they would if we had known the file size at the beginning.
     total_bytes_ = loader_->instance_size();
-    if (total_bytes_ != kPositionNotSpecified)
-      buffered_bytes_ = total_bytes_;
 
-    UpdateHostState_Locked();
+    if (host() && total_bytes_ != kPositionNotSpecified) {
+      host()->SetTotalBytes(total_bytes_);
+      host()->SetBufferedBytes(total_bytes_);
+    }
   }
   DoneRead_Locked(error);
 }
@@ -588,10 +589,15 @@
   if (stop_signal_received_)
     return;
 
-  is_downloading_data_ = is_downloading_data;
+  if (is_downloading_data != is_downloading_data_) {
+    is_downloading_data_ = is_downloading_data;
+    if (host())
+      host()->SetNetworkActivity(is_downloading_data);
+  }
+
   buffered_bytes_ = buffered_position + 1;
-
-  UpdateHostState_Locked();
+  if (host())
+    host()->SetBufferedBytes(buffered_bytes_);
 }
 
 void BufferedDataSource::UpdateHostState_Locked() {
@@ -603,7 +609,6 @@
 
   if (total_bytes_ != kPositionNotSpecified)
     host()->SetTotalBytes(total_bytes_);
-  host()->SetNetworkActivity(is_downloading_data_);
   host()->SetBufferedBytes(buffered_bytes_);
 }