Move ENABLE_PEPPER_CDMS to a buildflag header.

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("//mojo/public/tools/bindings/mojom.gni")
 import("//tools/grit/grit_rule.gni")
@@ skipping 195 matching lines @@
     "//crypto",
     "//extensions/common:common_constants",
     "//gin",
     "//google_apis",
     "//gpu/command_buffer/service",
     "//gpu/config",
     "//ipc",
     "//media",
     "//mojo/public/cpp/bindings",
     "//net",
+    "//ppapi/features",
     "//skia",
     "//third_party/icu",
     "//third_party/kasko:kasko_features",
     "//third_party/re2",
-    "//third_party/widevine/cdm:version_h",
+    "//third_party/widevine/cdm:headers",
     "//third_party/zlib:zip",
     "//ui/accessibility",
     "//ui/base",
     "//ui/gfx/ipc",
     "//ui/gfx/ipc/geometry",
     "//ui/gfx/ipc/skia",
     "//ui/gl",
     "//ui/message_center",
     "//ui/resources:resources",
     "//url",
@@ skipping 340 matching lines @@
     "//content/public/common:result_codes",
   ]
   deps = [
     ":features",
     ":version_header",
     "//base",
     "//base/third_party/dynamic_annotations",
     "//components/bookmarks/common",
     "//components/nacl/common:switches",
     "//media:cdm_paths",  # Needed by chrome_paths.cc.
-    "//third_party/widevine/cdm:version_h",
+    "//ppapi/features",
+    "//third_party/widevine/cdm:headers",
   ]
 
   if (is_android) {
     # This dependency must only be added for Android.
     #
     # On Windows, //chrome/installer/util depends on this target to get
     # constants. That target is in turn used in a number of installer helper
     # targets independent of Chrome that we want to keep small. So we don't
     # want something large like //ui/base.
     #
@@ skipping 76 matching lines @@
     "shell_handler_win.mojom",
   ]
 
   public_deps = [
     "//skia/public/interfaces",
     "//url/mojo:url_mojom_gurl",
   ]
 
   use_new_wrapper_types = false
 }