Add a gyp flag to allow removing dependency on ppapi.

chrome/chrome_browser_ui.gypi

 # Copyright 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.
 
 {
   'targets': [
     {
       'target_name': 'browser_ui',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
@@ skipping 2119 matching lines @@
         ['OS != "ios"', {
           'dependencies': [
             'autofill_regexes',
             'browser_extensions',
             'browser/performance_monitor/performance_monitor.gyp:performance_monitor',
             'common/extensions/api/api.gyp:api',
             'debugger',
             'installer_util',
             '../device/device.gyp:device_bluetooth',
             '../net/net.gyp:net_with_v8',
-            '../ppapi/ppapi_internal.gyp:ppapi_ipc',  # For PpapiMsg_LoadPlugin
             '../printing/printing.gyp:printing',
             '../third_party/adobe/flash/flash_player.gyp:flapper_version_h',
             '../third_party/expat/expat.gyp:expat',
             '../third_party/hunspell/hunspell.gyp:hunspell',
             '../third_party/leveldatabase/leveldatabase.gyp:leveldatabase',
             '../third_party/libjingle/libjingle.gyp:libjingle',
             '../third_party/libphonenumber/libphonenumber.gyp:libphonenumber',
             '../third_party/npapi/npapi.gyp:npapi',
             '../third_party/re2/re2.gyp:re2',
             '../ui/compositor/compositor.gyp:compositor',
@@ skipping 69 matching lines @@
         ['configuration_policy==1', {
           'dependencies': [
             'app/policy/cloud_policy_codegen.gyp:policy',
           ],
         }, {  # configuration_policy==0
           'sources/': [
             ['exclude', 'browser/ui/webui/policy_ui.cc'],
             ['exclude', 'browser/ui/webui/policy_ui.h'],
           ],
         }],
+        ['enable_plugins==1', {
+          'dependencies': [
+            '../ppapi/ppapi_internal.gyp:ppapi_ipc',
+          ],
+        }],
         ['safe_browsing==1', {
           'defines': [
             'FULL_SAFE_BROWSING',
           ],
         }, {  # safe_browsing==0 || safe_browsing==2
           'dependencies!': [
             'safe_browsing_proto',
             'safe_browsing_report_proto',
             '../third_party/libusb/libusb.gyp:libusb',
           ],
@@ skipping 529 matching lines @@
         }, { # else: enable_app_list==0
           'sources/': [
             ['exclude', '^browser/ui/views/app_list/'],
             ['exclude', '^browser/ui/app_list/'],
           ]
         }],
       ],
     },
   ],
 }