Remove webui_polymer2_browser_tests from Win 10 Tests x64 (dbg) bot

These tests are timing out periodically. Match the removal of
browser_tests, since the behavior is expected to be the same.

Bug: 876224
Change-Id: I76183e78fde8f10a1feae67db51ca4336a4c652e
Reviewed-on: https://chromium-review.googlesource.com/1197322Reviewed-by: John Budorick <jbudorick@chromium.org>
Commit-Queue: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#587675}

testing/buildbot/chromium.win.json

@@ -1507,17 +1507,6 @@
         },
         "test": "boringssl_ssl_tests"
       },
-      {
-        "args": [
-          "--enable-features=WebUIPolymer2",
-          "--test-launcher-filter-file=../../testing/buildbot/filters/webui_polymer2_browser_tests.filter"
-        ],
-        "name": "webui_polymer2_browser_tests",
-        "swarming": {
-          "can_use_on_swarming_builders": true
-        },
-        "test": "browser_tests"
-      },
       {
         "swarming": {
           "can_use_on_swarming_builders": true

testing/buildbot/test_suite_exceptions.pyl

@@ -1707,6 +1707,12 @@
       },
     },
   },
+  'webui_polymer2_browser_tests': {
+    'remove_from': [
+      # chromium.win
+      'Win10 Tests x64 (dbg)',  # Matches browser_tests.
+    ],
+  },
   'webui_polymer2_interactive_ui_tests': {
     'modifications': {
       # Match interactive_ui_tests, see https://crbug.com/840369