Rename experiment to FeedSendFeedback.

The experiment name needs to match finch instead of matching the
name of the flag we use in chromium.

Bug: 1045246
Change-Id: Ie64379eb275d3a0c51c9d3237d9e12602003cc8a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2117914
Commit-Queue: Alexei Svitkine <asvitkine@chromium.org>
Reviewed-by: Dan H <harringtond@chromium.org>
Reviewed-by: Alexei Svitkine <asvitkine@chromium.org>
Cr-Commit-Position: refs/heads/master@{#753222}

testing/variations/fieldtrial_testing_config.json

@@ -2300,6 +2300,21 @@
             ]
         }
     ],
+    "FeedSendFeedback": [
+        {
+            "platforms": [
+                "android"
+            ],
+            "experiments": [
+                {
+                    "name": "Enabled",
+                    "enable_features": [
+                        "InterestFeedFeedback"
+                    ]
+                }
+            ]
+        }
+    ],
     "FilterAdsOnAbusiveSites": [
         {
             "platforms": [
@@ -2933,21 +2948,6 @@
             ]
         }
     ],
-    "InterestFeedFeedback": [
-        {
-            "platforms": [
-                "android"
-            ],
-            "experiments": [
-                {
-                    "name": "Enabled",
-                    "enable_features": [
-                        "InterestFeedFeedback"
-                    ]
-                }
-            ]
-        }
-    ],
     "IsolatePasswordSites": [
         {
             "platforms": [