Revert "Mark some WebRTC perf measurements as biggerIsBetter"

This reverts commit 9c270678.

Reason for revert: mbonadei noticed error when running

Original change's description:
> Mark some WebRTC perf measurements as biggerIsBetter
>
> Change-Id: I95a145f0380b0f413a71ef5a9bbacf840eb20b9f
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2577205
> Commit-Queue: John Chen <johnchen@chromium.org>
> Auto-Submit: Ben Wagner aka dogben <benjaminwagner@google.com>
> Reviewed-by: Mirko Bonadei <mbonadei@chromium.org>
> Reviewed-by: John Chen <johnchen@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#834889}

TBR=mbonadei@chromium.org,johnchen@chromium.org,benjaminwagner@google.com,chromium-scoped@luci-project-accounts.iam.gserviceaccount.com

Change-Id: I4f90ecb003407c3737442f0a5d4ca691c4d12dbc
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2580527Reviewed-by: Mirko Bonadei <mbonadei@chromium.org>
Commit-Queue: Ben Wagner aka dogben <benjaminwagner@google.com>
Cr-Commit-Position: refs/heads/master@{#835135}

tools/perf/page_sets/webrtc_cases.py

@@ -48,7 +48,7 @@ class DataChannel(WebrtcPage):
   def ParseTestResults(self, action_runner):
     self.AddJavaScriptMeasurement(
         'data_transferred',
-        'bytes_biggerIsBetter',
+        'bytes',
         'receiveProgress.value',
         description='Amount of data transferred by data channel in 10 seconds')
 
@@ -155,7 +155,7 @@ class InsertableStreamsVideoProcessing(WebrtcPage):
 
   def ExecuteTest(self, action_runner):
     self.AddMeasurement(
-        'supported', 'count_biggerIsBetter', 1 if self.supported else 0,
+        'supported', 'count', 1 if self.supported else 0,
         'Boolean flag indicating if this benchmark is supported by the browser.'
     )
     if not self.supported:
@@ -178,7 +178,7 @@ class InsertableStreamsVideoProcessing(WebrtcPage):
       action_runner.Wait(10)
     self.AddJavaScriptMeasurement(
         'sink_decoded_frames',
-        'count_biggerIsBetter',
+        'count',
         'document.querySelector(".sinkVideo").webkitDecodedFrameCount',
         description='Number of frames received at the sink video.')