Revert of Revision Info into GenericSet

tracing/tracing/value/histogram_unittest.py

Index: tracing/tracing/value/histogram_unittest.py
diff --git a/tracing/tracing/value/histogram_unittest.py b/tracing/tracing/value/histogram_unittest.py
index a398db905b23078547d0270069bd4b93725521b2..015060ff9b55fd6e0543bb79b6c144e356907a6b 100644
--- a/tracing/tracing/value/histogram_unittest.py
+++ b/tracing/tracing/value/histogram_unittest.py
@@ -696,6 +696,31 @@
         'guid': 'def'
     })
     self.assertNotEqual(info0, info1)
+
+
+class RevisionInfoUnittest(unittest.TestCase):
+  def testRoundtrip(self):
+    info = histogram.RevisionInfo({
+        'chromiumCommitPosition': 42,
+        'v8CommitPosition': 57,
+        'chromium': ['b10563e'],
+        'v8': ['0a12a6'],
+        'catapult': ['e6e086'],
+        'angle': ['d7b1ab', 'da9fb0'],
+        'skia': ['966bb3', 'db402c'],
+        'webrtc': ['277b25', 'f8b262'],
+    })
+    d = info.AsDict()
+    clone = diagnostic.Diagnostic.FromDict(d)
+    self.assertEqual(ToJSON(d), ToJSON(clone.AsDict()))
+    self.assertEqual(clone.chromium_commit_position, 42)
+    self.assertEqual(clone.v8_commit_position, 57)
+    self.assertEqual(clone.chromium[0], 'b10563e')
+    self.assertEqual(clone.v8[0], '0a12a6')
+    self.assertEqual(clone.catapult[0], 'e6e086')
+    self.assertEqual(clone.angle[1], 'da9fb0')
+    self.assertEqual(clone.skia[1], 'db402c')
+    self.assertEqual(clone.webrtc[1], 'f8b262')
 
 
 class TelemetryInfoUnittest(unittest.TestCase):