Free the command buffer on destruction.

gpu/command_buffer/client/cmd_buffer_helper.cc

Index: gpu/command_buffer/client/cmd_buffer_helper.cc
diff --git a/gpu/command_buffer/client/cmd_buffer_helper.cc b/gpu/command_buffer/client/cmd_buffer_helper.cc
index aa85560dff38624a1ea0f7ed8d48863b24dbd776..3eba54fd60801900c7f7f1dcdf12bd0da4e9de93 100644
--- a/gpu/command_buffer/client/cmd_buffer_helper.cc
+++ b/gpu/command_buffer/client/cmd_buffer_helper.cc
@@ -69,20 +69,25 @@ bool CommandBufferHelper::AllocateRingBuffer() {
   return true;
 }
 
-void CommandBufferHelper::FreeRingBuffer() {
-  GPU_CHECK_EQ(put_, get_offset());
+void CommandBufferHelper::FreeResources() {
   if (HaveRingBuffer()) {
     command_buffer_->DestroyTransferBuffer(ring_buffer_id_);
     ring_buffer_id_ = -1;
   }
 }
 
+void CommandBufferHelper::FreeRingBuffer() {
+  GPU_CHECK_EQ(put_, get_offset());
+  FreeResources();
+}
+
 bool CommandBufferHelper::Initialize(int32 ring_buffer_size) {
   ring_buffer_size_ = ring_buffer_size;
   return AllocateRingBuffer();
 }
 
 CommandBufferHelper::~CommandBufferHelper() {
+  FreeResources();
 }
 
 bool CommandBufferHelper::FlushSync() {