Disable network_service_content_browsertests on Win10 x64 dbg.

Change-Id: I639edf669730918329f3368c73440062c3df1997
Bug: 839419,818832,852786
Reviewed-on: https://chromium-review.googlesource.com/1100962
Commit-Queue: John Budorick <jbudorick@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567705}

testing/buildbot/chromium.win.json

@@ -1468,17 +1468,6 @@
         },
         "test": "content_browsertests"
       },
-      {
-        "args": [
-          "--enable-features=NetworkService",
-          "--test-launcher-filter-file=../../testing/buildbot/filters/mojo.fyi.network_content_browsertests.filter"
-        ],
-        "name": "network_service_content_browsertests",
-        "swarming": {
-          "can_use_on_swarming_builders": true
-        },
-        "test": "content_browsertests"
-      },
       {
         "swarming": {
           "can_use_on_swarming_builders": true

testing/buildbot/test_suite_exceptions.pyl

@@ -1651,6 +1651,7 @@
     'remove_from': [
       # chromium.win
       'Win7 Tests (1)',  # For swarming capacity reasons.
+      'Win10 Tests x64 (dbg)',  # flaky: https://crbug.com/852786
     ],
   },
   'network_service_extensions_browsertests': {
@@ -1667,8 +1668,8 @@
     ],
     'modifications': {
       # chromium.win
-      'Win10 Tests x64 (dbg)': {  # temporary, https://crbug.com/818832
-        'experiment_percentage': 100,
+      'Win10 Tests x64 (dbg)': {
+        'experiment_percentage': 100,  # https://crbug.com/852786
       },
     },
   },