Add a gyp flag to allow removing dependency on ppapi.

content/content_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.
 
 {
   'dependencies': [
     '../jingle/jingle.gyp:jingle_glue',
     '../net/net.gyp:net',
-    '../ppapi/ppapi_internal.gyp:ppapi_host',
-    '../ppapi/ppapi_internal.gyp:ppapi_proxy',
-    '../ppapi/ppapi_internal.gyp:ppapi_shared',
     '../skia/skia.gyp:skia',
     '../third_party/hyphen/hyphen.gyp:hyphen',
     '../third_party/icu/icu.gyp:icuuc',
     '../third_party/icu/icu.gyp:icui18n',
     '../third_party/libjingle/libjingle.gyp:libjingle',
     '../third_party/npapi/npapi.gyp:npapi',
     '<(webkit_src_dir)/Source/WebKit/chromium/WebKit.gyp:webkit',
     '../ui/native_theme/native_theme.gyp:native_theme',
     '../ui/surface/surface.gyp:surface',
     '../v8/tools/gyp/v8.gyp:v8',
@@ skipping 179 matching lines @@
     'renderer/pepper/pepper_proxy_channel_delegate_impl.cc',
     'renderer/pepper/pepper_proxy_channel_delegate_impl.h',
     'renderer/pepper/pepper_video_capture_host.cc',
     'renderer/pepper/pepper_video_capture_host.h',
     'renderer/pepper/pepper_websocket_host.cc',
     'renderer/pepper/pepper_websocket_host.h',
     'renderer/pepper/renderer_ppapi_host_impl.cc',
     'renderer/pepper/renderer_ppapi_host_impl.h',
     'renderer/plugin_channel_host.cc',
     'renderer/plugin_channel_host.h',
+    'renderer/plugin_delegate_helper.cc',
+    'renderer/plugin_delegate_helper.h',
     'renderer/browser_plugin/browser_plugin.cc',
     'renderer/browser_plugin/browser_plugin.h',
     'renderer/browser_plugin/browser_plugin_backing_store.h',
     'renderer/browser_plugin/browser_plugin_backing_store.cc',
     'renderer/browser_plugin/browser_plugin_bindings.h',
     'renderer/browser_plugin/browser_plugin_bindings.cc',
     'renderer/browser_plugin/browser_plugin_manager.h',
     'renderer/browser_plugin/browser_plugin_manager.cc',
     'renderer/browser_plugin/browser_plugin_manager_factory.h',
     'renderer/browser_plugin/browser_plugin_manager_impl.h',
@@ skipping 137 matching lines @@
         'renderer/p2p/ipc_socket_factory.cc',
         'renderer/p2p/ipc_socket_factory.h',
         'renderer/p2p/port_allocator.cc',
         'renderer/p2p/port_allocator.h',
         'renderer/p2p/socket_client.cc',
         'renderer/p2p/socket_client.h',
         'renderer/p2p/socket_dispatcher.cc',
         'renderer/p2p/socket_dispatcher.h',
       ],
     }],
+    ['enable_ppapi==1', {
+      'dependencies': [
+        '../ppapi/ppapi_internal.gyp:ppapi_host',
+        '../ppapi/ppapi_internal.gyp:ppapi_proxy',
+        '../ppapi/ppapi_internal.gyp:ppapi_shared',
+      ],
+    }, {  # enable_ppapi==0
+      'sources/': [
+        ['exclude', '^renderer/pepper/'],
+      ],
+    }],
     ['java_bridge==1', {
       'defines': [
         'ENABLE_JAVA_BRIDGE',
       ],
     }, {
       'sources!': [
         'renderer/java/java_bridge_channel.cc',
         'renderer/java/java_bridge_channel.h',
         'renderer/java/java_bridge_dispatcher.cc',
         'renderer/java/java_bridge_dispatcher.h',
       ],
     }],
   ],
   'target_conditions': [
     ['OS=="android"', {
       'sources/': [
         ['include', '^renderer/render_view_linux\\.cc$'],
       ],
     }],
   ],
 }