GN: Remove duplicate entries from sources lists

content/content_browser.gypi

 # Copyright (c) 2012 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.
 
 {
   'dependencies': [
     '../base/base.gyp:base_static',
     '../crypto/crypto.gyp:crypto',
     '../google_apis/google_apis.gyp:google_apis',
     '../net/net.gyp:net',
@@ skipping 1035 matching lines @@
       'browser/renderer_host/overscroll_controller.h',
       'browser/renderer_host/overscroll_controller_delegate.h',
       'browser/renderer_host/popup_menu_helper_mac.h',
       'browser/renderer_host/popup_menu_helper_mac.mm',
       'browser/renderer_host/render_message_filter.cc',
       'browser/renderer_host/render_message_filter.h',
       'browser/renderer_host/render_process_host_impl.cc',
       'browser/renderer_host/render_process_host_impl.h',
       'browser/renderer_host/render_sandbox_host_linux.cc',
       'browser/renderer_host/render_sandbox_host_linux.h',
-      'browser/renderer_host/render_process_host_impl.h',
       'browser/renderer_host/render_view_host_delegate.cc',
       'browser/renderer_host/render_view_host_delegate.h',
       'browser/renderer_host/render_view_host_delegate_view.h',
       'browser/renderer_host/render_view_host_factory.cc',
       'browser/renderer_host/render_view_host_factory.h',
       'browser/renderer_host/render_view_host_impl.cc',
       'browser/renderer_host/render_view_host_impl.h',
       'browser/renderer_host/render_widget_helper.cc',
       'browser/renderer_host/render_widget_helper.h',
       'browser/renderer_host/render_widget_host_delegate.cc',
@@ skipping 802 matching lines @@
       'sources': [
         'browser/media/cdm/browser_cdm_manager.cc',
         'browser/media/cdm/browser_cdm_manager.h',
         # This works on Android because enable_browser_cdms==1 on Android.
         'browser/media/media_web_contents_observer.cc',
         'browser/media/media_web_contents_observer.h',
       ],
     }],
   ],
 }