Revert "Added IInspectable EGLNativeWindowType and ICoreWindow support" due to build failures on Chromium FYI bots.

This reverts commit 406a3be9.

Change-Id: Ica2abd2e557a4fd9852d85b7fc018e3d272b6edf
Reviewed-on: https://chromium-review.googlesource.com/224051Reviewed-by: Shannon Woods <shannonwoods@chromium.org>
Tested-by: Shannon Woods <shannonwoods@chromium.org>