Fixes gn-check errors with enable_plugins=false.

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("//build/buildflag_header.gni")
 import("//build/util/process_version.gni")
 import("//chrome/common/features.gni")
 import("//chrome/process_version_rc_template.gni")  # For branding_file_path.
 import("//extensions/features/features.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
@@ skipping 132 matching lines @@
     "switch_utils.h",
     "trace_event_args_whitelist.cc",
     "trace_event_args_whitelist.h",
     "tts_messages.h",
     "tts_utterance_request.cc",
     "tts_utterance_request.h",
     "url_constants.cc",
     "url_constants.h",
     "web_application_info.cc",
     "web_application_info.h",
-    "widevine_cdm_constants.cc",
-    "widevine_cdm_constants.h",
   ]
   defines = []
 
   configs += [
     "//build/config:precompiled_headers",
     "//build/config/compiler:wexit_time_destructors",
   ]
 
   public_deps = [
     ":features",
@@ skipping 307 matching lines @@
       "ppapi_utils.h",
     ]
     public_deps += [ "//third_party/adobe/flash:flapper_version_h" ]
   }
   if (enable_plugins && enable_extensions) {
     sources += [
       "pepper_permission_util.cc",
       "pepper_permission_util.h",
     ]
   }
+  if (enable_pepper_cdms) {
+    sources += [
+      "widevine_cdm_constants.cc",
+      "widevine_cdm_constants.h",
+    ]
+  }
   if (!enable_webrtc) {
     sources -= [ "media/webrtc_logging_messages.h" ]
   }
 
   if (safe_browsing_mode != 0) {
     sources += [
       "safe_browsing/file_type_policies.cc",
       "safe_browsing/file_type_policies.h",
     ]
 
@@ skipping 202 matching lines @@
 mojom("instant_mojom") {
   sources = [
     "instant.mojom",
   ]
 
   public_deps = [
     "//mojo/common:common_custom_types",
     "//url/mojo:url_mojom_gurl",
   ]
 }