Free the command buffer on destruction.

gpu/command_buffer/client/transfer_buffer_unittest.cc

Index: gpu/command_buffer/client/transfer_buffer_unittest.cc
diff --git a/gpu/command_buffer/client/transfer_buffer_unittest.cc b/gpu/command_buffer/client/transfer_buffer_unittest.cc
index 4f14e74b6d4f169d18be9ad39cf22faa3a280fa0..469483b98141938aafb3c81765bbbb151e38b8ed 100644
--- a/gpu/command_buffer/client/transfer_buffer_unittest.cc
+++ b/gpu/command_buffer/client/transfer_buffer_unittest.cc
@@ -75,6 +75,10 @@ void TransferBufferTest::TearDown() {
         .Times(1)
         .RetiresOnSaturation();
   }
+  // For command buffer.
+  EXPECT_CALL(*command_buffer(), DestroyTransferBuffer(_))
+      .Times(1)
+      .RetiresOnSaturation();
   transfer_buffer_.reset();
 }
 
@@ -281,6 +285,10 @@ void TransferBufferExpandContractTest::TearDown() {
         .Times(1)
         .RetiresOnSaturation();
   }
+  // For command buffer.
+  EXPECT_CALL(*command_buffer(), DestroyTransferBuffer(_))
+      .Times(1)
+      .RetiresOnSaturation();
   transfer_buffer_.reset();
 }