Revert 260177 "By keeping track of transfer buffer usage (both s..."

trunk/src/gpu/command_buffer/client/buffer_tracker.cc

Index: trunk/src/gpu/command_buffer/client/buffer_tracker.cc
===================================================================
--- trunk/src/gpu/command_buffer/client/buffer_tracker.cc	(revision 260192)
+++ trunk/src/gpu/command_buffer/client/buffer_tracker.cc	(working copy)
@@ -60,30 +60,8 @@
   buffer->shm_id_ = 0;
   buffer->shm_offset_ = 0;
   buffer->address_ = NULL;
-  buffer->last_usage_token_ = 0;
-  buffer->last_async_upload_token_ = 0;
 }
 
-void BufferTracker::Unmanage(Buffer* buffer) {
-  buffer->size_ = 0;
-  buffer->shm_id_ = 0;
-  buffer->shm_offset_ = 0;
-  buffer->address_ = NULL;
-  buffer->last_usage_token_ = 0;
-  buffer->last_async_upload_token_ = 0;
-}
 
-void BufferTracker::Free(Buffer* buffer) {
-  if (buffer->address_)
-    mapped_memory_->Free(buffer->address_);
-
-  buffer->size_ = 0;
-  buffer->shm_id_ = 0;
-  buffer->shm_offset_ = 0;
-  buffer->address_ = NULL;
-  buffer->last_usage_token_ = 0;
-  buffer->last_async_upload_token_ = 0;
-}
-
 }  // namespace gles2
 }  // namespace gpu