Fix Chrome linker errors in GN build.

chrome/common/BUILD.gn

 # Copyright 2014 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("//tools/grit/grit_rule.gni")
 
 gypi_values = exec_script(
     "//build/gypi_to_gn.py",
     [ rebase_path("../chrome_common.gypi") ],
     "scope",
@@ skipping 193 matching lines @@
     deps += [
       "//third_party/mach_override",
       "//third_party/google_toolbox_for_mac",
     ]
   }
 
   if (enable_remoting) {
     deps += [ "//remoting/client/plugin" ]
   }
   if (enable_plugins) {
+    sources += [
+      "pepper_flash.cc",
+      "pepper_flash.h",
+      "pepper_permission_util.cc",
+      "pepper_permission_util.h",
+    ]
     deps += [
       "//third_party/adobe/flash:flapper_version_h",
     ]
-  } else {
-    sources -= [ "pepper_permission_util.cc" ]
   }
   if (!enable_webrtc) {
     sources -= [ "media/webrtc_logging_messages.h" ]
   }
   if (enable_configuration_policy) {
     deps += [ "//components/policy" ]
   }
 
   if (safe_browsing_mode == 1) {
     defines += [ "FULL_SAFE_BROWSING" ]
@@ skipping 55 matching lines @@
     "//components/bookmarks/common",
     "//third_party/widevine/cdm:version_h",
   ]
 
   if (enable_nacl) {
     deps += [
       #'../components/nacl.gyp:nacl_switches',  TODO(GYP)
     ]
   }
 }