Move WebMIMERegistry impl from //content to blink:platform/network/mime

third_party/WebKit/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("//mojo/public/tools/bindings/mojom.gni")
 import("//third_party/WebKit/Source/config.gni")
 import("//tools/grit/grit_rule.gni")
 
 if (is_android) {
   import("//build/config/android/rules.gni")
@@ skipping 207 matching lines @@
     "platform/WebMediaStreamCenter.h",
     "platform/WebMediaStreamCenterClient.h",
     "platform/WebMediaStreamSource.h",
     "platform/WebMediaStreamTrack.h",
     "platform/WebMediaStreamTrackSourcesRequest.h",
     "platform/WebMemoryCoordinator.h",
     "platform/WebMemoryPressureLevel.h",
     "platform/WebMemoryState.h",
     "platform/WebMessagePortChannel.h",
     "platform/WebMessagePortChannelClient.h",
-    "platform/WebMimeRegistry.h",
     "platform/WebMixedContent.h",
     "platform/WebMockClipboard.h",
     "platform/WebNativeScrollBehavior.h",
     "platform/WebNavigationHintType.h",
     "platform/WebNonCopyable.h",
     "platform/WebOriginTrialTokenStatus.h",
     "platform/WebPageVisibilityState.h",
     "platform/WebPasswordCredential.h",
     "platform/WebPlatformEventListener.h",
     "platform/WebPlatformEventType.h",
@@ skipping 509 matching lines @@
 # relegated to a separate target to avoid duplication between the variants.
 source_set("shared_typemap_traits") {
   visibility = [ ":*" ]
   sources = [
     "web/WindowFeaturesStructTraits.cpp",
   ]
   deps = [
     ":new_wrapper_types_mojo_bindings_shared__generator",
   ]
 }