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This reverts commit 8eed4853.

Reason for revert: Suspected of breaking the following test:
org.chromium.chrome.browser.browseractions.BrowserActionActivityTest.testOpenSingleTabInBackgroundWhenChromeAvailable

On the Android CFI bot:
https://ci.chromium.org/p/chromium/builders/luci.chromium.ci/Android%20CFI

Original change's description:
> Reland: Remove SeparateTaskCustomTabActivity for Android version > L.
> 
> Cause of revert:
> ===============
> A few MediaLauncherActivityTest don't run on the CQ. They were waiting
> on SeparateTaskCustomTabActivity to finish, but it is no more used.
> 
> Original description:
> =====================
> Remove SeparateTaskcustomTabActivity for Android version > L.
> 
> Make SeparateTaskcustomTabActivity to be used only for Android version
> pre L. The part used for Android version >= L is merged into
> CustomTabActivity.
> 
> This is a prerequisite for skipping the ChromeLauncherActivity and
> directly launch the CustomTabActivity.
> 
> TBR=tedchoc@chromium.org
> R=​lizeb@chromium.org
> 
> Bug: 681559
> Change-Id: I121241a2f43f62c346a24adb153649bec3b80af3
> Reviewed-on: https://chromium-review.googlesource.com/1201845
> Reviewed-by: Benoit L <lizeb@chromium.org>
> Commit-Queue: Arthur Sonzogni <arthursonzogni@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#588788}

TBR=lizeb@chromium.org,arthursonzogni@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: 681559
Change-Id: I002cddd65d1fc326c5a212671d4f7d07355689a6
Reviewed-on: https://chromium-review.googlesource.com/1211242Reviewed-by: Justin Donnelly <jdonnelly@chromium.org>
Commit-Queue: Justin Donnelly <jdonnelly@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589233}