Revert of [Mirror Android] Temporarily remove the Mirror flag....

Revert of [Mirror Android] Temporarily remove the Mirror flag. (https://codereview.chromium.org/231983003/)

Reason for revert:
r262868 was droved to M-35 branch as r262870.
Now we need to re-enable Mirror on trunk.

Original issue's description:
> [Mirror Android] Temporarily remove the Mirror flag.
> 
> Once in trunk this needs to be picked up to M35 beta branch.
> Once picked up, this needs to be reverted on trunk.
> 
> BUG=361827
> NOTRY=True
> 
> Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=262868

TBR=rogerta@chromium.org,aruslan@chromium.org
NOTREECHECKS=true
NOTRY=true
BUG=361827

Review URL: https://codereview.chromium.org/232183003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@262872 0039d316-1c4b-4281-b951-d872f2087c98

chrome/browser/about_flags.cc

@@ -1463,7 +1463,7 @@ const Experiment kExperiments[] = {
     "enable-new-profile-management",
     IDS_FLAGS_ENABLE_NEW_PROFILE_MANAGEMENT_NAME,
     IDS_FLAGS_ENABLE_NEW_PROFILE_MANAGEMENT_DESCRIPTION,
-    kOsMac | kOsWin | kOsLinux,
+    kOsAndroid | kOsMac | kOsWin | kOsLinux,
     SINGLE_VALUE_TYPE(switches::kNewProfileManagement)
   },
   {