Refactor GuestViewContainer to split out WebView related logic and MimeHandlerView related logic.

extensions/renderer/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.
 
 # GYP version: extensions/extensions.gyp:extensions_renderer
 source_set("renderer") {
   sources = [
     "activity_log_converter_strategy.cc",
     "activity_log_converter_strategy.h",
     "api_activity_logger.cc",
@@ skipping 33 matching lines @@
     "extensions_render_frame_observer.cc",
     "extensions_render_frame_observer.h",
     "extensions_renderer_client.cc",
     "extensions_renderer_client.h",
     "file_system_natives.cc",
     "file_system_natives.h",
     "guest_view/guest_view_container.cc",
     "guest_view/guest_view_container.h",
     "guest_view/guest_view_internal_custom_bindings.cc",
     "guest_view/guest_view_internal_custom_bindings.h",
+    "guest_view/mime_handler_view_container.cc",
+    "guest_view/mime_handler_view_container.h",
+    "guest_view/web_view_container.cc",
+    "guest_view/web_view_container.h",
     "i18n_custom_bindings.cc",
     "i18n_custom_bindings.h",
     "id_generator_custom_bindings.cc",
     "id_generator_custom_bindings.h",
     "lazy_background_page_native_handler.cc",
     "lazy_background_page_native_handler.h",
     "logging_native_handler.cc",
     "logging_native_handler.h",
     "messaging_bindings.cc",
     "messaging_bindings.h",
@@ skipping 97 matching lines @@
     "//skia",
     "//third_party/WebKit/public:blink",
   ]
 
   if (is_win) {
     cflags = [
       "/wd4267", # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
     ]
   }
 }