Remove unused WebMIMERegistry

sky/engine/public/BUILD.gn

 # 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.
 
 import("//tools/grit/grit_rule.gni")
 
 group("test_support") {
   deps = [
     "//sky/engine/web:test_support",
   ]
@@ skipping 47 matching lines @@
     "platform/WebHTTPBody.h",
     "platform/WebHTTPHeaderVisitor.h",
     "platform/WebHTTPLoadInfo.h",
     "platform/WebImage.h",
     "platform/WebImageLayer.h",
     "platform/WebLayer.h",
     "platform/WebLayerClient.h",
     "platform/WebLayerScrollClient.h",
     "platform/WebLayerTreeView.h",
     "platform/WebLocalizedString.h",
-    "platform/WebMimeRegistry.h",
     "platform/WebNonCopyable.h",
     "platform/WebPoint.h",
     "platform/WebPrivateOwnPtr.h",
     "platform/WebPrivatePtr.h",
     "platform/WebRect.h",
     "platform/WebReferrerPolicy.h",
     "platform/WebRenderingStats.h",
     "platform/WebScreenInfo.h",
     "platform/WebScreenOrientationType.h",
     "platform/WebSelectionBound.h",
@@ skipping 78 matching lines @@
     "web/WebURLLoaderOptions.h",
     "web/WebUserGestureIndicator.h",
     "web/WebUserGestureToken.h",
     "web/WebView.h",
     "web/WebViewClient.h",
     "web/WebWidget.h",
     "web/WebWidgetClient.h",
     "web/linux/WebFontRendering.h",
   ]
 }