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Revert of [WebAPKs] Make WebAPK update flow more sensible (patchset #4 id:100001 of https://codereview.chromium.org/2827233006/ )

Reason for revert:
broke official-* bots, see crbug.com/716330

Original issue's description:
> [WebAPKs] Make WebAPK update flow more sensible
>
> Previously, whenever the shell_apk in shell_apk_version.gni there was a period
> of time during which
> - Chrome tries to update the WebAPK because the "shell_apk" version with which
>   Chrome is compiled with was updated
> - The WebAPK server is unable to fulfill the update request because the new
>   ShellAPK has not yet been uploaded to the WebAPK server
>
> This CL splits shell_apk_version in shell_apk_version.gni into two variables:
> |template_shell_apk_version| and |expected_shell_apk_version|
>
> The new flow for updating android/webapk/shell_apk will be:
> 1) Write CL which:
>    - Makes changes to code in android/webapk/shell_apk
>    - Increments |template_shell_apk_version|
>    This will:
>    - Update the template ShellAPK which is built on the official build bot
>    - Trigger an alert that the ShellAPK on the WebAPK Minting Server needs to
>      be updated
>    - Does not affect the "WebAPK update logic".
> 2) Upload new ShellAPK template to the WebAPK Minting Server
>    At this point:
>    - new WebAPK installs will have the updated shell.
>    - Chrome will still not request updates to the new ShellAPK version
> 3) Write CL which:
>    - Increments |expected_shell_apk_version|
>    This will:
>    - cause Chrome to request updates to the new ShellAPK version
>
> BUG=708053
>
> Review-Url: https://codereview.chromium.org/2827233006
> Cr-Commit-Position: refs/heads/master@{#467708}
> Committed: https://chromium.googlesource.com/chromium/src/+/d71abed75b07b4b9fc50591cbeb2b6c8874bf448

TBR=hartmanng@chromium.org,hanxi@chromium.org,zpeng@chromium.org,dominickn@chromium.org,pkotwicz@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=708053

Review-Url: https://codereview.chromium.org/2845943006
Cr-Commit-Position: refs/heads/master@{#467966}