build: [m67] enable widevine support (#14519)

* build: [m67] enable widevine support

* fix: remove plugin cache reset hack

It was added in (#8907) to make widevine cdm shows up in
navigator.plugins, since widevine support is no longer
enabled by a plugin it can be removed safely.

atom/renderer/renderer_client_base.cc

@@ -170,9 +170,6 @@ void RendererClientBase::RenderFrameCreated(
   new ContentSettingsObserver(render_frame);
   new printing::PrintWebViewHelper(render_frame);
 
-  // This is required for widevine plugin detection provided during runtime.
-  blink::ResetPluginCache();
-
 #if defined(ENABLE_PDF_VIEWER)
   // Allow access to file scheme from pdf viewer.
   blink::WebSecurityPolicy::AddOriginAccessWhitelistEntry(

atom/renderer/renderer_client_base.h

@@ -10,6 +10,8 @@
 
 #include "content/public/renderer/content_renderer_client.h"
 #include "third_party/blink/public/web/web_local_frame.h"
+// In SHARED_INTERMEDIATE_DIR.
+#include "widevine_cdm_version.h"  // NOLINT(build/include)
 
 #if defined(WIDEVINE_CDM_AVAILABLE)
 #include "chrome/renderer/media/chrome_key_systems_provider.h"