Bug 1799435 - Make RFP checks faster. r=smaug, a=RyanVM

...ponents/resistfingerprinting/test/mochitest/mochitest.ini

...ents/resistfingerprinting/test/mochitest/test_iframe.html

dom/base/Document.cpp

dom/base/Document.h

dom/base/Element.cpp

dom/base/Navigator.cpp

dom/base/nsContentUtils.cpp

dom/base/nsContentUtils.h

dom/base/nsGlobalWindowInner.cpp

dom/base/nsGlobalWindowOuter.cpp

dom/base/nsMimeTypeArray.cpp

dom/base/nsPluginArray.cpp

dom/canvas/CanvasUtils.cpp

dom/canvas/ClientWebGLContext.cpp

dom/events/KeyboardEvent.cpp

dom/events/PointerEvent.cpp

dom/gamepad/GamepadManager.cpp

dom/html/HTMLVideoElement.cpp

dom/html/MediaError.cpp

dom/media/MediaDevices.cpp