Bug 1881845 - Remove nsContentCID.h r=smaug,media-playback-reviewers,karlt

All of these components have been converted to static registration, making this
file unneeded.

Differential Revision: https://phabricator.services.mozilla.com/D202633

dom/html/HTMLInputElement.cpp

@@ -49,7 +49,6 @@
 #include "nsSearchControlFrame.h"
 #include "nsPIDOMWindow.h"
 #include "nsRepeatService.h"
-#include "nsContentCID.h"
 #include "mozilla/dom/ProgressEvent.h"
 #include "nsGkAtoms.h"
 #include "nsStyleConsts.h"