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This CL renames most of WebLayer's Site Settings files to just Settings
in preparation of introducing more Settings UIs.

This introduces a new ISettingsFragment rather than renaming
ISiteSettingsFragment because renaming the interface results in a
"SecurityException: Binder invocation to an incorrect interface"
exception when launching Site Settings.

Bug: 1106393
Change-Id: Ifbeb15a8ff51776a901e0136dfbdcb4b19543a39
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2572689
Commit-Queue: Robbie McElrath <rmcelrath@chromium.org>
Reviewed-by: Bo <boliu@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#834358}