Remove ForwardMemoryPressureEventsToGpuProcess from the testing config.

Bug: 1126640
Change-Id: Ia75100b4e4f620e5adbcfe2631899dcdfa9c0b3c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2626052Reviewed-by: Sébastien Marchand <sebmarchand@chromium.org>
Commit-Queue: Caitlin Fischer <caitlinfischer@google.com>
Cr-Commit-Position: refs/heads/master@{#843266}

testing/variations/fieldtrial_testing_config.json

@@ -3222,24 +3222,6 @@
             ]
         }
     ],
-    "ForwardMemoryPressureEventsToGpuProcess": [
-        {
-            "platforms": [
-                "chromeos",
-                "linux",
-                "mac",
-                "windows"
-            ],
-            "experiments": [
-                {
-                    "name": "Enabled",
-                    "enable_features": [
-                        "ForwardMemoryPressureEventsToGpuProcess"
-                    ]
-                }
-            ]
-        }
-    ],
     "FragmentItem": [
         {
             "platforms": [