diff -urN chromium-67.0.3371.0.old/third_party/widevine/cdm/BUILD.gn chromium-67.0.3371.0/third_party/widevine/cdm/BUILD.gn

--- chromium-67.0.3371.0.old/third_party/widevine/cdm/BUILD.gn  2018-03-20 12:06:16.192778982 +0100

+++ chromium-67.0.3371.0/third_party/widevine/cdm/BUILD.gn  2018-03-20 12:09:54.184846595 +0100

@@ -10,12 +10,6 @@

 import("//media/media_options.gni")

 import("//third_party/widevine/cdm/widevine.gni")

-# Internal Cast builds set enable_widevine=true to bring in Widevine support.

-# TODO(xhwang): Support component updated CDM on other platforms and remove this

-# assert.

-assert(!enable_widevine || is_win || is_mac || is_chromecast,

-       "Component updated CDM only supported on Windows and Mac for now.")

-

 widevine_arch = current_cpu

 if (widevine_arch == "x86") {

   widevine_arch = "ia32"

diff -urN chromium-67.0.3371.0.old/third_party/widevine/cdm/stub/widevine_cdm_version.h chromium-67.0.3371.0/third_party/widevine/cdm/stub/widevine_cdm_version.h

--- chromium-67.0.3371.0.old/third_party/widevine/cdm/stub/widevine_cdm_version.h   2018-03-20 12:06:16.192778982 +0100

+++ chromium-67.0.3371.0/third_party/widevine/cdm/stub/widevine_cdm_version.h   2018-03-20 12:08:24.415172133 +0100

@@ -10,6 +10,7 @@

 #include "third_party/widevine/cdm/widevine_cdm_common.h"

+#define WIDEVINE_CDM_VERSION_STRING "unknown"

 #define WIDEVINE_CDM_AVAILABLE

 #endif  // WIDEVINE_CDM_VERSION_H_

​