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This reverts commit bf228a61.

Reason for revert: Didn't compile properly on CrOS (which we missed due to a bad CQ configuration).

Original change's description:
> Reuse kArcIntentHelperPackageName in c/b/
> 
> Reusing kArcIntentHelperPackageName where needed. Also adding a method
> to reuse such package name + a custom string appended to it, this is
> AppendStringToIntentHelperPackageName.
> 
> Bug: None
> Test: Build.
> Change-Id: I1b9115b808533e1e5ed3339b7f3747496ca2f0c3
> Reviewed-on: https://chromium-review.googlesource.com/764396
> Reviewed-by: Scott Violet <sky@chromium.org>
> Reviewed-by: Yusuke Sato <yusukes@chromium.org>
> Commit-Queue: David Jacobo <djacobo@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#516326}

TBR=yusukes@chromium.org,sky@chromium.org,djacobo@chromium.org

Change-Id: Idfef3e2b248c5a1339bb97c47be0f3a6cdf84ba3
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: None
Reviewed-on: https://chromium-review.googlesource.com/769187Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Dirk Pranke <dpranke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#516341}