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This reverts commit 58ab87ff.

Reason for revert: suspected for lsan browser_tests and mus_browser_tests failures since
https://ci.chromium.org/buildbot/chromium.memory/Linux%20Chromium%20OS%20ASan%20LSan%20Tests%20%281%29/25937
 - AppBannerManagerBrowserTest.CheckOnLoadWithSufficientEngagementCancelBannerAfterPromptInHandler
 - AppBannerManagerBrowserTest.ExperimentalFlowWebAppBannerReprompt
 - AppBannerManagerBrowserTest.ExperimentalFlowWebAppBannerPromptNeedsGesture

(and others in later runs)> Possibly timeout related.

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}

TBR=mgiuca@chromium.org,dominickn@chromium.org

Change-Id: Ie030290324c689b3df616de9aa35b6e52e7584c5
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 806923
Reviewed-on: https://chromium-review.googlesource.com/895024Reviewed-by: Trent Apted <tapted@chromium.org>
Commit-Queue: Trent Apted <tapted@chromium.org>
Cr-Commit-Position: refs/heads/master@{#533178}