Fix bug in net::RequestPriority -> HTTP/2 dependency conversion.

testing/variations/fieldtrial_testing_config_android.json

 {
     "AndroidSessionNotifications": [
         {
             "group_name": "Disabled"
         }
     ],
     "AsyncDns": [
         {
             "group_name": "AsyncDnsA"
         },
@@ skipping 315 matching lines @@
     "SchedulerExpensiveTaskBlocking": [
         {
             "group_name": "Enabled"
         }
     ],
     "SdchPersistence": [
         {
             "group_name": "Enabled"
         }
     ],
-    "SpdyEnableDependencies": [
-        {
-            "group_name": "Enable"
-        }
-    ],
     "SpeculativeResourcePrefetching": [
         {
             "group_name": "v=1a:Prefetching=Enabled:Predictor=Url"
         },
         {
             "group_name": "v=1b:Prefetching=Enabled:Predictor=Url:Confidence=High"
         },
         {
             "group_name": "v=1c:Prefetching=Enabled:Predictor=Url:Confidence=Low"
         },
@@ skipping 112 matching lines @@
     ],
     "use-new-media-cache": [
         {
             "enable_features": [
                 "use-new-media-cache"
             ],
             "group_name": "Enabled"
         }
     ]
 }