Move ENABLE_PEPPER_CDMS to a buildflag header.

chrome/renderer/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/config/features.gni")
 import("//tools/grit/grit_rule.gni")
 
 grit("resources") {
   source = "resources/renderer_resources.grd"
   use_qualified_include = true
@@ skipping 107 matching lines @@
     "//content/public/renderer",
     "//media",
     "//net",
     "//skia",
     "//storage/common",
     "//third_party/WebKit/public:blink",
     "//third_party/WebKit/public:image_resources",
     "//third_party/WebKit/public:resources",
     "//third_party/icu",
     "//third_party/re2",
+    "//third_party/widevine/cdm:cdm_features",
     "//third_party/widevine/cdm:version_h",
     "//ui/surface",
     "//v8:v8",
   ]
 
   configs += [ "//build/config/compiler:wexit_time_destructors" ]
 
   if (enable_nacl) {
     deps += [
       "//components/nacl/loader",
@@ skipping 245 matching lines @@
     ]
   }
 
   if (is_android) {
     sources -= [
       "safe_browsing/mock_feature_extractor_clock.cc",
       "safe_browsing/mock_feature_extractor_clock.h",
     ]
   }
 }