Telemetry / Android: further cleanup on surface_stats_collector.

tools/telemetry/telemetry/core/chrome/android_platform_backend.py

Index: tools/telemetry/telemetry/core/chrome/android_platform_backend.py
diff --git a/tools/telemetry/telemetry/core/chrome/android_platform_backend.py b/tools/telemetry/telemetry/core/chrome/android_platform_backend.py
index e5d8036ba798b2da54a62ba89e1cc902b0bdf970..a1d4745dee26ad3055aced519caa9b2539167eee 100644
--- a/tools/telemetry/telemetry/core/chrome/android_platform_backend.py
+++ b/tools/telemetry/telemetry/core/chrome/android_platform_backend.py
@@ -42,12 +42,11 @@ class AndroidPlatformBackend(platform_backend.PlatformBackend):
   def StartRawDisplayFrameRateMeasurement(self):
     assert not self._surface_stats_collector
     self._surface_stats_collector = \
-        surface_stats_collector.SurfaceStatsCollector(self._adb, '')
-    self._surface_stats_collector.SuppressPrintingResults()
-    self._surface_stats_collector.__enter__()
+        surface_stats_collector.SurfaceStatsCollector(self._adb)
+    self._surface_stats_collector.Start()
 
   def StopRawDisplayFrameRateMeasurement(self):
-    self._surface_stats_collector.__exit__()
+    self._surface_stats_collector.Stop()
     for r in self._surface_stats_collector.GetResults():
       self._raw_display_frame_rate_measurements.append(
           platform.Platform.RawDisplayFrameRateMeasurement(