Telemetry: Removed unused code from InspectorWebsocket.

tools/telemetry/telemetry/core/backends/chrome_inspector/inspector_runtime.py

Index: tools/telemetry/telemetry/core/backends/chrome_inspector/inspector_runtime.py
diff --git a/tools/telemetry/telemetry/core/backends/chrome_inspector/inspector_runtime.py b/tools/telemetry/telemetry/core/backends/chrome_inspector/inspector_runtime.py
index 9585e10909d563c4e1c4ed750f30c31566352a08..1708384cdf828309a7a12f4cf74397253ff89789 100644
--- a/tools/telemetry/telemetry/core/backends/chrome_inspector/inspector_runtime.py
+++ b/tools/telemetry/telemetry/core/backends/chrome_inspector/inspector_runtime.py
@@ -7,10 +7,7 @@ from telemetry.core import exceptions
 class InspectorRuntime(object):
   def __init__(self, inspector_websocket):
     self._inspector_websocket = inspector_websocket
-    self._inspector_websocket.RegisterDomain(
-        'Runtime',
-        self._OnNotification,
-        self._OnClose)
+    self._inspector_websocket.RegisterDomain('Runtime', self._OnNotification)
     self._contexts_enabled = False
     self._max_context_id = None
 
@@ -20,9 +17,6 @@ class InspectorRuntime(object):
       self._max_context_id = max(self._max_context_id,
                                  msg['params']['context']['id'])
 
-  def _OnClose(self):
-    pass
-
   def Execute(self, expr, context_id, timeout):
     self.Evaluate(expr + '; 0;', context_id, timeout)