Promote win7-rel out of experimental CQ status.

The immediate outage has passed. It's still got pretty high swarming test
pending times, but that was the case prior to the outage, and I don't
think that should block us from adding it back to the CQ.

R=jbudorick, dpranke

Bug: 960100
Change-Id: I6254ddb07da89ed8b85fa410bffbe9d5a332887b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1599876
Commit-Queue: Ben Pastene <bpastene@chromium.org>
Reviewed-by: John Budorick <jbudorick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#657381}

docs/infra/cq_builders.md

@@ -70,6 +70,8 @@ These builders must pass before a CL may land.
 
 * [win10_chromium_x64_rel_ng](https://ci.chromium.org/p/chromium/builders/luci.chromium.try/win10_chromium_x64_rel_ng) ([`commit-queue.cfg` entry](https://cs.chromium.org/search/?q=package:%5Echromium$+file:commit-queue.cfg+chromium/try/win10_chromium_x64_rel_ng)) ([matching builders](https://cs.chromium.org/search/?q=file:trybots.py+win10_chromium_x64_rel_ng))
 
+* [win7-rel](https://ci.chromium.org/p/chromium/builders/luci.chromium.try/win7-rel) ([`commit-queue.cfg` entry](https://cs.chromium.org/search/?q=package:%5Echromium$+file:commit-queue.cfg+chromium/try/win7-rel)) ([matching builders](https://cs.chromium.org/search/?q=file:trybots.py+win7-rel))
+
 * [win_chromium_compile_dbg_ng](https://ci.chromium.org/p/chromium/builders/luci.chromium.try/win_chromium_compile_dbg_ng) ([`commit-queue.cfg` entry](https://cs.chromium.org/search/?q=package:%5Echromium$+file:commit-queue.cfg+chromium/try/win_chromium_compile_dbg_ng)) ([matching builders](https://cs.chromium.org/search/?q=file:trybots.py+win_chromium_compile_dbg_ng))
 
 
@@ -314,13 +316,6 @@ as required builders.
 
   * Experimental percentage: 40
 
-* [win7-rel](https://ci.chromium.org/p/chromium/builders/luci.chromium.try/win7-rel) ([`commit-queue.cfg` entry](https://cs.chromium.org/search/?q=package:%5Echromium$+file:commit-queue.cfg+chromium/try/win7-rel)) ([matching builders](https://cs.chromium.org/search/?q=file:trybots.py+win7-rel))
-
-  TODO(crbug.com/960100): Promote win7-rel out of experimental if things
-  are stable.
-
-  * Experimental percentage: 100
-
 * [win7_chromium_rel_loc_exp](https://ci.chromium.org/p/chromium/builders/luci.chromium.try/win7_chromium_rel_loc_exp) ([`commit-queue.cfg` entry](https://cs.chromium.org/search/?q=package:%5Echromium$+file:commit-queue.cfg+chromium/try/win7_chromium_rel_loc_exp)) ([matching builders](https://cs.chromium.org/search/?q=file:trybots.py+win7_chromium_rel_loc_exp))
 
   * Experimental percentage: 20

infra/config/commit-queue.cfg

@@ -140,6 +140,9 @@ config_groups {
       builders {
         name: "chromium/try/win10_chromium_x64_rel_ng"
       }
+      builders {
+        name: "chromium/try/win7-rel"
+      }
       builders {
         name: "chromium/try/win_chromium_compile_dbg_ng"
       }
@@ -356,12 +359,6 @@ config_groups {
         name: "chromium/try/linux-goma-rbe-staging-rel"
         experiment_percentage: 40
       }
-      # TODO(crbug.com/960100): Promote win7-rel out of experimental if things
-      # are stable.
-      builders {
-        name: "chromium/try/win7-rel"
-        experiment_percentage: 100
-      }
       builders {
         name: "chromium/try/win7_chromium_rel_loc_exp"
         experiment_percentage: 20