Remove FrameViewBase as base class of PluginView.

third_party/WebKit/Source/core/frame/BUILD.gn

 # Copyright 2016 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("//third_party/WebKit/Source/core/core.gni")
 
 blink_core_sources("frame") {
   sources = [
     "BarProp.cpp",
     "BarProp.h",
@@ skipping 23 matching lines @@
     "EventHandlerRegistry.cpp",
     "EventHandlerRegistry.h",
     "External.h",
     "Frame.cpp",
     "Frame.h",
     "FrameClient.h",
     "FrameConsole.cpp",
     "FrameConsole.h",
     "FrameLifecycle.cpp",
     "FrameLifecycle.h",
+    "FrameOrPlugin.h",
     "FrameOwner.h",
     "FrameSerializer.cpp",
     "FrameSerializer.h",
     "FrameTypes.h",
     "FrameView.cpp",
     "FrameView.h",
     "FrameViewAutoSizeInfo.cpp",
     "FrameViewAutoSizeInfo.h",
     "History.cpp",
     "History.h",
@@ skipping 67 matching lines @@
     "csp/MediaListDirective.h",
     "csp/SourceListDirective.cpp",
     "csp/SourceListDirective.h",
   ]
 
   configs += [
     # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
     "//build/config/compiler:no_size_t_to_int_warning",
   ]
 }