Bug 1387831 - mochitest clipboard isn't running on windows anymore. r=jmaher,kmoir

We accidentally left mochitest clipboard enabled only for try, this removes its tier setting of 2 on windows 7, and makes it run wherever the corresponding builds run.

MozReview-Commit-ID: I2ybhqPtswV

--HG--
extra : rebase_source : 2516f6bce22e66a3444ac8c61231a47a74de3c0c

taskcluster/ci/test/tests.yml

@@ -695,10 +695,6 @@ mochitest-clipboard:
     loopback-video: true
     virtualization: hardware
     instance-size: xlarge
-    run-on-projects:
-        by-test-platform:
-            windows.*: ['try']
-            default: built-projects
     worker-type:
         by-test-platform:
             windows7-32.*: buildbot-bridge/buildbot-bridge
@@ -732,10 +728,6 @@ mochitest-clipboard:
                             - remove_executables.py
                 extra-options:
                     - --mochitest-suite=plain-clipboard,chrome-clipboard,browser-chrome-clipboard
-    tier:
-        by-test-platform:
-            windows7-32.*: 2
-            default: default
 
 mochitest-devtools-chrome:
     description: "Mochitest devtools-chrome run"