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This is a reland of 58ab87ff.

Original change's description:
> Consolidate app banner testing.
> 
> This CL removes several different app banner testing files, and replaces
> them by calling the necessary JavaScript setup code in one test file.
> For instance, all tests will no longer have the "appinstalled" title
> overwriting, as that will only be active when the appropriate setup
> JavaScript is run.
> 
> This allows future tests to be more easily added, and reduces collisions
> when manipulating the page title.
> 
> BUG=806923
> 
> Change-Id: Ia28837b8675a2e1fe329cb1df1be4798ddb03d02
> Reviewed-on: https://chromium-review.googlesource.com/892182
> Commit-Queue: Dominick Ng <dominickn@chromium.org>
> Reviewed-by: Matt Giuca <mgiuca@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#532978}

Bug: 806923
Change-Id: Ia85a5be0828ad0820a891f8cde9d9e492dc0b831
Reviewed-on: https://chromium-review.googlesource.com/896326Reviewed-by: Matt Giuca <mgiuca@chromium.org>
Reviewed-by: Ted Choc <tedchoc@chromium.org>
Commit-Queue: Dominick Ng <dominickn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#533745}