Define WIDEVINE_CDM_VERSION_STRING && re-re-re-patch for latest ninja

Stolen from Arch basically.

gmt

--- a/chrome/common/chrome_content_client.cc
+++ b/chrome/common/chrome_content_client.cc
@@ -99,7 +99,7 @@
 // Registers Widevine CDM if Widevine is enabled, the Widevine CDM is
 // bundled and not a component. When the Widevine CDM is a component, it is
 // registered in widevine_cdm_component_installer.cc.
-#if BUILDFLAG(BUNDLE_WIDEVINE_CDM) && !BUILDFLAG(ENABLE_WIDEVINE_CDM_COMPONENT)
+#if BUILDFLAG(ENABLE_WIDEVINE) && !BUILDFLAG(ENABLE_WIDEVINE_CDM_COMPONENT)
 #define REGISTER_BUNDLED_WIDEVINE_CDM
 #include "third_party/widevine/cdm/widevine_cdm_common.h"  // nogncheck
 // TODO(crbug.com/663554): Needed for WIDEVINE_CDM_VERSION_STRING. Support
--- a/third_party/widevine/cdm/widevine_cdm_version.h
+++ b/third_party/widevine/cdm/widevine_cdm_version.h
@@ -11,5 +11,6 @@
 // If the Widevine CDM is available define the following:
 //  - WIDEVINE_CDM_VERSION_STRING (with the version of the CDM that's available
 //    as a string, e.g., "1.0.123.456").
+#define WIDEVINE_CDM_VERSION_STRING "unknown"
 
 #endif  // WIDEVINE_CDM_VERSION_H_