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This reverts commit 1f54c905.

Reason for revert: Speculative fix for https://crbug.com/968005 (ExtensionApiTest.ChromeRuntimeOpenOptionsPage test failing on MSAN bots)

Original change's description:
> [Extension test] Add ability to load event_page extension as SW extension.
> 
> Add a flag to RunExtensionTest so that an existing event page based
> test extension can be loaded as SW based extension. This can be
> used to run extenision tests with Service Worker based extensions.
> 
> This CL also converts runtime/open_options_page/ test extension to event
> page extension and demonstrates that the extension be loaded
> as SW extension and the corresponding test
> ExtensionApiTest.ChromeRuntimeOpenOptionsPage passes with the flag in
> ServiceWorkerBasedBackgroundTest.ChromeRuntimeOpenOptionsPage.
> 
> Doc: https://docs.google.com/document/d/1PvXZ7VGRGdmd1s99SFByn9NCGj0GAiBhhPmfjj35ZeI/edit#
> 
> Bug: 967899
> Change-Id: I8821d1c9fa22795b8fe0f65f1bd073a034e24431
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1626455
> Commit-Queue: Istiaque Ahmed <lazyboy@chromium.org>
> Reviewed-by: Devlin <rdevlin.cronin@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#664062}

TBR=lazyboy@chromium.org,rdevlin.cronin@chromium.org

Change-Id: Ia818e2881a2802e981246c93d205a0ffb9ff9096
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 967899
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1634509Reviewed-by: Adam Rice <ricea@chromium.org>
Commit-Queue: Adam Rice <ricea@chromium.org>
Cr-Commit-Position: refs/heads/master@{#664148}