Force MimeHandlerView to always use BrowserPlugin

content/public/common/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("//build/buildflag_header.gni")
 import("//build/config/chromecast_build.gni")
 import("//build/config/features.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 import("//third_party/webrtc/build/webrtc.gni")
 
@@ skipping 74 matching lines @@
   public_configs = [ ":static_switches_defines" ]
 }
 
 source_set("common_sources") {
   # External code should depend on via ":common" above.
   visibility = [ "//content/*" ]
 
   sources = [
     "appcache_info.h",
     "bindings_policy.h",
-    "browser_plugin_guest_mode.cc",
-    "browser_plugin_guest_mode.h",
     "browser_side_navigation_policy.cc",
     "browser_side_navigation_policy.h",
     "cdm_info.h",
     "child_process_host.h",
     "child_process_host_delegate.cc",
     "child_process_host_delegate.h",
     "child_process_sandbox_support_linux.h",
     "color_suggestion.cc",
     "color_suggestion.h",
     "common_param_traits.cc",
@@ skipping 183 matching lines @@
 source_set("feature_h264_with_openh264_ffmpeg") {
   deps = [
     ":features",
     "//base",
   ]
   sources = [
     "feature_h264_with_openh264_ffmpeg.cc",
     "feature_h264_with_openh264_ffmpeg.h",
   ]
 }