Add CefRegisterWidevineCdm function and remove component updater support (issue #2009)

Mac: Check in widevinecdmadapter.plugin binary until Widevine GN build errors are resolved (https://crbug.com/626436).

libcef/browser/context.cc

@@ -13,6 +13,7 @@
 #include "libcef/browser/trace_subscriber.h"
 #include "libcef/common/cef_switches.h"
 #include "libcef/common/main_delegate.h"
+#include "libcef/common/widevine_loader.h"
 #include "libcef/renderer/content_renderer_client.h"
 
 #include "base/base_switches.h"
@@ -376,6 +377,10 @@ void CefContext::OnContextInitialized() {
 
   static_cast<ChromeBrowserProcessStub*>(g_browser_process)->Initialize();
 
+#if defined(WIDEVINE_CDM_AVAILABLE) && defined(ENABLE_PEPPER_CDMS)
+  CefWidevineLoader::GetInstance()->OnContextInitialized();
+#endif
+
   // Notify the handler.
   CefRefPtr<CefApp> app = CefContentClient::Get()->application();
   if (app.get()) {