Fix shared memory leak on command buffer teardown

gpu/command_buffer/client/gles2_implementation_unittest.cc

Index: gpu/command_buffer/client/gles2_implementation_unittest.cc
diff --git a/gpu/command_buffer/client/gles2_implementation_unittest.cc b/gpu/command_buffer/client/gles2_implementation_unittest.cc
index 75890744b2df849a03c57f5e30e4a95a6c0241f5..2ffe7785b6c3b5bff7309609306769a93d6ff8d1 100644
--- a/gpu/command_buffer/client/gles2_implementation_unittest.cc
+++ b/gpu/command_buffer/client/gles2_implementation_unittest.cc
@@ -21,6 +21,7 @@
 #endif
 
 using testing::_;
+using testing::AtLeast;
 using testing::AnyNumber;
 using testing::DoAll;
 using testing::InSequence;
@@ -485,8 +486,7 @@ void GLES2ImplementationTest::TearDown() {
   EXPECT_CALL(*command_buffer(), OnFlush()).Times(AnyNumber());
   // For command buffer.
   EXPECT_CALL(*command_buffer(), DestroyTransferBuffer(_))
-      .Times(1)
-      .RetiresOnSaturation();
+      .Times(AtLeast(1));
   gl_.reset();
 }