Remove unused WebMIMERegistry

sky/engine/testing/platform/webmimeregistry_impl.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 SKY_ENGINE_TESTING_PLATFORM_WEBMIMEREGISTRY_IMPL_H_
-#define SKY_ENGINE_TESTING_PLATFORM_WEBMIMEREGISTRY_IMPL_H_
-
-#include "base/compiler_specific.h"
-#include "sky/engine/public/platform/WebMimeRegistry.h"
-
-namespace sky {
-
-class WebMimeRegistryImpl : public blink::WebMimeRegistry {
- public:
-  WebMimeRegistryImpl() {}
-  virtual ~WebMimeRegistryImpl() {}
-
-  // WebMimeRegistry methods:
-  virtual blink::WebMimeRegistry::SupportsType supportsMIMEType(
-      const blink::WebString& mime_type);
-  virtual blink::WebMimeRegistry::SupportsType supportsImageMIMEType(
-      const blink::WebString& mime_type);
-  virtual blink::WebMimeRegistry::SupportsType supportsImagePrefixedMIMEType(
-      const blink::WebString& mime_type);
-  virtual blink::WebMimeRegistry::SupportsType supportsJavaScriptMIMEType(
-      const blink::WebString& mime_type);
-  virtual blink::WebMimeRegistry::SupportsType supportsMediaMIMEType(
-      const blink::WebString& mime_type,
-      const blink::WebString& codecs,
-      const blink::WebString& key_system);
-  virtual blink::WebMimeRegistry::SupportsType supportsNonImageMIMEType(
-      const blink::WebString& mime_type);
-  virtual blink::WebString mimeTypeForExtension(
-      const blink::WebString& extension);
-  virtual blink::WebString wellKnownMimeTypeForExtension(
-      const blink::WebString& extension);
-  virtual blink::WebString mimeTypeFromFile(
-      const blink::WebString& path);
-};
-
-}  // namespace sky
-
-#endif  // SKY_ENGINE_TESTING_PLATFORM_WEBMIMEREGISTRY_IMPL_H_