Fix field trial for SafeBrowsingNetworkContexts

The actual study name is SafeBrowsingPerProfileNetworkContexts, so finch
still shows a warning on missing field trial config: http://cl/345754952

Bug: None
Change-Id: Ia01ceb12f0a08102363c6439d626631d5b9fe6b2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2575880
Auto-Submit: Xinghui Lu <xinghuilu@chromium.org>
Commit-Queue: Robert Kaplow <rkaplow@chromium.org>
Reviewed-by: Robert Kaplow <rkaplow@chromium.org>
Cr-Commit-Position: refs/heads/master@{#834225}

testing/variations/fieldtrial_testing_config.json

@@ -6151,24 +6151,6 @@
             ]
         }
     ],
-    "SafeBrowsingNetworkContexts": [
-        {
-            "platforms": [
-                "windows",
-                "linux",
-                "mac"
-            ],
-            "experiments": [
-                {
-                    "name": "Enabled",
-                    "enable_features": [
-                        "SafeBrowsingRemoveCookies",
-                        "SafeBrowsingSeparateNetworkContexts"
-                    ]
-                }
-            ]
-        }
-    ],
     "SafeBrowsingPasswordProtectionForSavedPasswords": [
         {
             "platforms": [
@@ -6240,6 +6222,24 @@
             ]
         }
     ],
+    "SafeBrowsingPerProfileNetworkContexts": [
+        {
+            "platforms": [
+                "windows",
+                "linux",
+                "mac"
+            ],
+            "experiments": [
+                {
+                    "name": "Enabled",
+                    "enable_features": [
+                        "SafeBrowsingRemoveCookies",
+                        "SafeBrowsingSeparateNetworkContexts"
+                    ]
+                }
+            ]
+        }
+    ],
     "SafeBrowsingRealTimeUrlLookupEnabledWithToken": [
         {
             "platforms": [