Remove deprecated methods related to tracing in browser.py.

tools/telemetry/telemetry/core/browser.py

Index: tools/telemetry/telemetry/core/browser.py
diff --git a/tools/telemetry/telemetry/core/browser.py b/tools/telemetry/telemetry/core/browser.py
index c711b0939a89b82a44e035c5c433e249a3838fd6..d4adc9ee24a3310e289f598e0e48daed8a8ca0c1 100644
--- a/tools/telemetry/telemetry/core/browser.py
+++ b/tools/telemetry/telemetry/core/browser.py
@@ -14,8 +14,6 @@ from telemetry.core import tab_list
 from telemetry.core import wpr_modes
 from telemetry.core import wpr_server
 from telemetry.core.backends import browser_backend
-from telemetry.core.platform import tracing_category_filter
-from telemetry.core.platform import tracing_options
 from telemetry.core.platform.profiler import profiler_finder
 
 
@@ -95,10 +93,6 @@ class Browser(object):
           'Extensions not supported')
     return extension_dict.ExtensionDict(self._browser_backend.extension_backend)
 
-  @property
-  def supports_tracing(self):
-    return self.platform.tracing_controller.IsChromeTracingSupported(self)
-
   def is_profiler_active(self, profiler_name):
     return profiler_name in [profiler.name() for
                              profiler in self._active_profilers]
@@ -274,29 +268,6 @@ class Browser(object):
     self._active_profilers = []
     return output_files
 
-
-  def StartTracing(self, custom_categories=None, timeout=10):
-    """Note: this function is deprecated. Prefer platform.tracing_controller."""
-    if not isinstance(custom_categories,
-                      tracing_category_filter.TracingCategoryFilter):
-      category_filter = tracing_category_filter.TracingCategoryFilter(
-          filter_string=custom_categories)
-    else:
-      category_filter = custom_categories
-    options = tracing_options.TracingOptions()
-    options.enable_chrome_trace = True
-    return self.platform.tracing_controller.Start(
-        options, category_filter, timeout)
-
-  @property
-  def is_tracing_running(self):
-    """Note: this function is deprecated. Prefer platform.tracing_controller."""
-    return self.platform.tracing_controller.is_tracing_running
-
-  def StopTracing(self):
-    """Note: this function is deprecated. Prefer platform.tracing_controller."""
-    return self.platform.tracing_controller.Stop()
-
   def Start(self):
     browser_options = self._browser_backend.browser_options
     self.platform.FlushDnsCache()