[blink scheduler] Enable OptOutZeroTimeoutTimersFromThrottling in testing config.

Results from Canary/Dev experiment look good. Enabling in testing config
to allow Beta experiment.

Unused entries are removed from fieldtrial_testing_config.json to
work around crbug.com/1053702.

Bug: 1075553
Change-Id: I1bcec218175187b99f6ab0a3ac8008da3125aed6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2398977
Commit-Queue: François Doray <fdoray@chromium.org>
Reviewed-by: Steven Holte <holte@chromium.org>
Cr-Commit-Position: refs/heads/master@{#805445}

testing/variations/fieldtrial_testing_config.json

@@ -272,44 +272,6 @@
             ]
         }
     ],
-    "AutofillCacheServerCardInfo": [
-        {
-            "platforms": [
-                "android",
-                "android_weblayer",
-                "android_webview",
-                "chromeos",
-                "ios",
-                "linux",
-                "mac",
-                "windows"
-            ],
-            "experiments": [
-                {
-                    "name": "Enabled",
-                    "enable_features": [
-                        "AutofillCacheServerCardInfo"
-                    ]
-                }
-            ]
-        }
-    ],
-    "AutofillCreditCardAuthentication": [
-        {
-            "platforms": [
-                "mac",
-                "windows"
-            ],
-            "experiments": [
-                {
-                    "name": "Enabled",
-                    "enable_features": [
-                        "AutofillCreditCardAuthentication"
-                    ]
-                }
-            ]
-        }
-    ],
     "AutofillEnableCardNicknameManagementAndUpstream": [
         {
             "platforms": [
@@ -4802,6 +4764,27 @@
             ]
         }
     ],
+    "OptOutZeroTimeoutTimersFromThrottling": [
+        {
+            "platforms": [
+                "android",
+                "android_weblayer",
+                "android_webview",
+                "chromeos",
+                "linux",
+                "mac",
+                "windows"
+            ],
+            "experiments": [
+                {
+                    "name": "Enabled",
+                    "enable_features": [
+                        "OptOutZeroTimeoutTimersFromThrottling"
+                    ]
+                }
+            ]
+        }
+    ],
     "OptimizationHintsNoPersistentStore": [
         {
             "platforms": [