Remove the SafeBrowsingUseLocalBlacklist experiment

Bug: 
Change-Id: I2eebca66bc726e1b70fbadea65710a0a5021db1b
Reviewed-on: https://chromium-review.googlesource.com/794025Reviewed-by: Varun Khaneja <vakh@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Commit-Queue: Varun Khaneja <vakh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#519904}

testing/variations/fieldtrial_testing_config.json

@@ -3250,21 +3250,6 @@
             ]
         }
     ],
-    "SafeBrowsingUseLocalBlacklist": [
-        {
-            "platforms": [
-                "android"
-            ],
-            "experiments": [
-                {
-                    "name": "Use3PAPI",
-                    "params": {
-                        "check_local_blacklist": "false"
-                    }
-                }
-            ]
-        }
-    ],
     "SearchEnginePromo": [
         {
             "platforms": [