remove win7_chromium_rel_loc_exp builder

Currently, I don't have time to investment this further.
Also after switching to lld, compile step time is not so large on the
builder.
Let me remove this until I found this is really plausible for CQ
performance improvement.

Bug: 779440
Change-Id: Ied4e7ea6daa54837383d0364779e4522c5b22604
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1722271Reviewed-by: Yoshisato Yanagisawa <yyanagisawa@google.com>
Commit-Queue: Takuto Ikuta <tikuta@chromium.org>
Auto-Submit: Takuto Ikuta <tikuta@chromium.org>
Cr-Commit-Position: refs/heads/master@{#681741}

docs/infra/cq_builders.md

@@ -318,7 +318,3 @@ as required builders.
 
   * Experimental percentage: 10
 
-* [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

@@ -361,10 +361,6 @@ config_groups {
         name: "chromium/try/linux-coverage-rel"
         experiment_percentage: 10
       }
-      builders {
-        name: "chromium/try/win7_chromium_rel_loc_exp"
-        experiment_percentage: 20
-      }
 
       retry_config {
         single_quota: 1

infra/config/cr-buildbucket.cfg

@@ -4472,7 +4472,6 @@ buckets {
       name: "win7-rel"
       execution_timeout_secs: 16200  # 4.5h
     }
-    builders { mixins: "win-try" name: "win7_chromium_rel_loc_exp" }
     builders { mixins: "win-try" name: "win-annotator-rel" }
     builders {
       mixins: "win-try"

infra/config/luci-milo.cfg

@@ -4555,9 +4555,6 @@ consoles {
   builders {
     name: "buildbucket/luci.chromium.try/win10_chromium_x64_rel_ng"
   }
-  builders {
-    name: "buildbucket/luci.chromium.try/win7_chromium_rel_loc_exp"
-  }
   builders {
     name: "buildbucket/luci.chromium.try/win_archive"
   }
@@ -5139,9 +5136,6 @@ consoles {
   builders {
     name: "buildbucket/luci.chromium.try/win10_chromium_x64_rel_ng_exp"
   }
-  builders {
-    name: "buildbucket/luci.chromium.try/win7_chromium_rel_loc_exp"
-  }
   builders {
     name: "buildbucket/luci.chromium.try/win-angle-rel"
   }

tools/mb/mb_config.pyl

@@ -856,7 +856,6 @@
       'gpu-fyi-try-win10-nvidia-rel': 'gpu_fyi_tests_release_trybot_x86',
       'gpu-try-win10-nvidia-dbg': 'gpu_tests_debug_trybot_x86',
       'gpu-try-win10-nvidia-rel': 'gpu_tests_release_trybot_x86_resource_whitelisting',
-      'win7_chromium_rel_loc_exp': 'gpu_tests_release_trybot_x86_resource_whitelisting',
       'win10_chromium_x64_dbg_ng': 'gpu_tests_debug_trybot',
       'win10_chromium_x64_rel_ng': 'gpu_tests_release_trybot_resource_whitelisting',
       'win10_chromium_x64_rel_ng_exp': 'release_trybot',