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This CL refactors ExtensionContextMenuApiTest.
ExtensionContextMenuApiTest's functions and member variables related to
visibility testing are moved to ExtensionContextMenuVisibilityApiTest. Furthermore, ExtensionApiTest.ContextMenus is divided to four tests and is moved to ExtensionContextMenuVisibilityApiTest.

Bug: 1093066
Change-Id: I6142790b01b583eb6664712d1fb1ab7df08452de
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2468346Reviewed-by: David Bertoni <dbertoni@chromium.org>
Commit-Queue: Ghazale Hosseinabadi <ghazale@chromium.org>
Cr-Commit-Position: refs/heads/master@{#817726}