Remove separate cache for clip mask textures

src/gpu/GrClipMaskCache.cpp

-
-/*
- * Copyright 2012 Google Inc.
- *
- * Use of this source code is governed by a BSD-style license that can be
- * found in the LICENSE file.
- */
-
-#include "GrClipMaskCache.h"
-
-GrClipMaskCache::GrClipMaskCache(GrResourceProvider* resourceProvider)
-    : fStack(sizeof(GrClipStackFrame))
-    , fResourceProvider(resourceProvider) {
-    // We need an initial frame to capture the clip state prior to
-    // any pushes
-    new (fStack.push_back()) GrClipStackFrame;
-}
-
-void GrClipMaskCache::push() { new (fStack.push_back()) GrClipStackFrame; }