Add the other Windows builders to filter_compile_builders.

We're seeing the dbg builder have pending jobs so this should help reduce that.

BUG=109173
R=sky@chromium.org

Review URL: https://codereview.chromium.org/506273005

Cr-Commit-Position: refs/heads/master@{#292016}

testing/buildbot/chromium_trybot.json

@@ -208,7 +208,9 @@
   ],
 
   "filter_compile_builders": [
+    "win_chromium_compile_dbg",
     "win_chromium_rel_swarming",
-    "win_chromium_x64_rel_swarming"
+    "win_chromium_x64_rel_swarming",
+    "win8_chromium_rel"
   ]
 }