Remove deprecated methods related to tracing in browser.py.

tools/perf/measurements/smoothness_controller.py

Index: tools/perf/measurements/smoothness_controller.py
diff --git a/tools/perf/measurements/smoothness_controller.py b/tools/perf/measurements/smoothness_controller.py
index b66c6eb7110059de60b94302cac384f1a2f8b01e..8d3e07a184042f9f7676ea805e4c24327f2e0115 100644
--- a/tools/perf/measurements/smoothness_controller.py
+++ b/tools/perf/measurements/smoothness_controller.py
@@ -4,6 +4,8 @@
 import sys
 
 from measurements import smooth_gesture_util
+from telemetry.core.platform import tracing_category_filter
+from telemetry.core.platform import tracing_options
 from telemetry.timeline.model import TimelineModel
 from telemetry.page import page_test
 from telemetry.page.actions import action_runner
@@ -38,7 +40,12 @@ class SmoothnessController(object):
     # the ref builds are updated. crbug.com/386847
     custom_categories = ['webkit.console', 'blink.console', 'benchmark']
     custom_categories += page.GetSyntheticDelayCategories()
-    tab.browser.StartTracing(','.join(custom_categories), 60)
+    category_filter = tracing_category_filter.TracingCategoryFilter()
+    for c in custom_categories:
+      category_filter.AddIncludedCategory(c)
+    options = tracing_options.TracingOptions()
+    options.enable_chrome_trace = True
+    tab.browser.platform.tracing_controller.Start(options, category_filter, 60)
     if tab.browser.platform.IsRawDisplayFrameRateSupported():
       tab.browser.platform.StartRawDisplayFrameRateMeasurement()
 
@@ -54,7 +61,7 @@ class SmoothnessController(object):
     # Stop tracing for smoothness metric.
     if tab.browser.platform.IsRawDisplayFrameRateSupported():
       tab.browser.platform.StopRawDisplayFrameRateMeasurement()
-    self._tracing_timeline_data = tab.browser.StopTracing()
+    self._tracing_timeline_data = tab.browser.platform.tracing_controller.Stop()
     self._timeline_model = TimelineModel(
       timeline_data=self._tracing_timeline_data)
 
@@ -117,5 +124,5 @@ class SmoothnessController(object):
   def CleanUp(self, tab):
     if tab.browser.platform.IsRawDisplayFrameRateSupported():
       tab.browser.platform.StopRawDisplayFrameRateMeasurement()
-    if tab.browser.is_tracing_running:
-      tab.browser.StopTracing()
+    if tab.browser.platform.tracing_controller.is_tracing_running:
+      tab.browser.platform.tracing_controller.Stop()