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WebLayerShellActivity currently serves two purposes.
* As a demo app for weblayer where user can type in a url and expect it
  behave somewhat like a browser.
* As the target activity for instrumentation tests.

Keeping both purposes in the same activity is a maintenance burden and
makes the more complicated than it needs to be. This CL creates a new
InstrumentationActivity (copied from WebLayerShellActivity) and removes
code from both Activity that's needed for their purpose.

Also rename WebLayerShellActivityTestRule to
InstrumentationActivityTestRule.

Change-Id: I306fecb57ed15ee7a59487ced40262094ef7c438
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1888451
Commit-Queue: Scott Violet <sky@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#710848}