aw: Remove legacy rendering path

android_webview/browser/hardware_renderer_interface.h

-// Copyright 2014 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef ANDROID_WEBVIEW_BROWSER_HARDWARE_RENDERER_INTERFACE_H_
-#define ANDROID_WEBVIEW_BROWSER_HARDWARE_RENDERER_INTERFACE_H_
-
-struct AwDrawGLInfo;
-
-namespace android_webview {
-
-struct DrawGLResult;
-
-class HardwareRendererInterface {
- public:
-  virtual ~HardwareRendererInterface() {}
-
-  virtual bool DrawGL(bool stencil_enabled,
-                      int framebuffer_binding_ext,
-                      AwDrawGLInfo* draw_info,
-                      DrawGLResult* result) = 0;
-};
-
-}  // namespace android_webview
-
-#endif  // ANDROID_WEBVIEW_BROWSER_HARDWARE_RENDERER_INTERFACE_H_