Split real time lookup with desktop and Android in field trials.

Currently desktop and Android share the same study. They are both
enabled to 1% Stable. Going forward, we will roll out desktop study
to 100% Stable in M83 and roll out Android study to 100% Stable in
M85.

Server-side CL: http://cl/320706459

See https://crbug.com/1040670#c122 for more context.

Bug: 1070324
Change-Id: I8fc93d5fe470678c669ffb8d7544a78ba84bc328
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2295924Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Commit-Queue: Xinghui Lu <xinghuilu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#787926}

testing/variations/fieldtrial_testing_config.json

@@ -6102,7 +6102,6 @@
     "SafeBrowsingRealTimeUrlLookupEnabledWithToken": [
         {
             "platforms": [
-                "android",
                 "chromeos",
                 "linux",
                 "mac",
@@ -6118,6 +6117,21 @@
             ]
         }
     ],
+    "SafeBrowsingRealTimeUrlLookupEnabledWithTokenAndroid": [
+        {
+            "platforms": [
+                "android"
+            ],
+            "experiments": [
+                {
+                    "name": "Enabled",
+                    "enable_features": [
+                        "SafeBrowsingRealTimeUrlLookupEnabledWithToken"
+                    ]
+                }
+            ]
+        }
+    ],
     "SafeBrowsingSuspiciousSiteTrigger": [
         {
             "platforms": [