Fix dtor of web_contents.

BUG=NONE
TEST=run_tests
Review URL: https://codereview.chromium.org/12253002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@182313 0039d316-1c4b-4281-b951-d872f2087c98

tools/telemetry/telemetry/tab.py

@@ -20,10 +20,7 @@ class Tab(web_contents.WebContents):
     super(Tab, self).__init__(inspector_backend)
 
   def __del__(self):
-    self.Disconnect()
-
-  def Disconnect(self):
-    self._inspector_backend.Disconnect()
+    super(Tab, self).__del__()
 
   @property
   def browser(self):

tools/telemetry/telemetry/web_contents.py

@@ -4,11 +4,19 @@
 
 DEFAULT_WEB_CONTENTS_TIMEOUT = 60
 
+# TODO(achuith, dtu, nduca): Add unit tests specifically for WebContents,
+# independent of Tab.
 class WebContents(object):
   """Represents web contents in the browser"""
   def __init__(self, inspector_backend):
     self._inspector_backend = inspector_backend
 
+  def __del__(self):
+    self.Disconnect()
+
+  def Disconnect(self):
+    self._inspector_backend.Disconnect()
+
   def WaitForDocumentReadyStateToBeComplete(self,
       timeout=DEFAULT_WEB_CONTENTS_TIMEOUT):
     self._inspector_backend.WaitForDocumentReadyStateToBeComplete(timeout)