Add a gyp flag to allow removing dependency on ppapi.

chrome/chrome_renderer.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.
 
 {
   'targets': [
     {
       'target_name': 'renderer',
       'type': 'static_library',
       'variables': { 'enable_wexit_time_destructors': 1, },
       'dependencies': [
         'common',
         'common_net',
         'chrome_resources.gyp:chrome_resources',
         'chrome_resources.gyp:chrome_strings',
         '../content/content.gyp:content_renderer',
         '../net/net.gyp:net',
-        '../ppapi/ppapi_internal.gyp:ppapi_host',
-        '../ppapi/ppapi_internal.gyp:ppapi_proxy',
-        '../ppapi/ppapi_internal.gyp:ppapi_ipc',
-        '../ppapi/ppapi_internal.gyp:ppapi_shared',
         '../printing/printing.gyp:printing',
         '../skia/skia.gyp:skia',
         '../third_party/hunspell/hunspell.gyp:hunspell',
         '../third_party/icu/icu.gyp:icui18n',
         '../third_party/icu/icu.gyp:icuuc',
         '../third_party/npapi/npapi.gyp:npapi',
         '../third_party/WebKit/Source/WebKit/chromium/WebKit.gyp:webkit',
         '../ui/surface/surface.gyp:surface',
         '../webkit/support/webkit_support.gyp:glue',
         '../webkit/support/webkit_support.gyp:webkit_gpu',
@@ skipping 248 matching lines @@
         'renderer/visitedlink_slave.h',
         'renderer/webview_color_overlay.cc',
         'renderer/webview_color_overlay.h',
       ],
       'conditions': [
         ['disable_nacl!=1', {
           'dependencies': [
             'nacl',
           ],
         }],
+        ['enable_ppapi==1', {
+          'dependencies': [
+            '../ppapi/ppapi_internal.gyp:ppapi_host',
+            '../ppapi/ppapi_internal.gyp:ppapi_proxy',
+            '../ppapi/ppapi_internal.gyp:ppapi_ipc',
+            '../ppapi/ppapi_internal.gyp:ppapi_shared',
+          ],
+        }, {  # enable_ppapi==0
+          'sources/': [
+            ['exclude', '^renderer/pepper/'],
+          ],
+        }],
         ['safe_browsing==1', {
           'defines': [
             'ENABLE_SAFE_BROWSING',
           ],
           'dependencies': [
             'safe_browsing_proto',
             '../third_party/smhasher/smhasher.gyp:murmurhash3',
           ],
         }, {  # safe_browsing==0
           'sources/': [
@@ skipping 41 matching lines @@
               'export_dependent_settings': [
                 '<(allocator_target)',
               ],
             }],
           ],
         }],
       ],
     },
   ],
 }