Also catch devtools_http.DevToolsClientConnectionError.

tools/telemetry/telemetry/core/backends/chrome/misc_web_contents_backend.py

Index: tools/telemetry/telemetry/core/backends/chrome/misc_web_contents_backend.py
diff --git a/tools/telemetry/telemetry/core/backends/chrome/misc_web_contents_backend.py b/tools/telemetry/telemetry/core/backends/chrome/misc_web_contents_backend.py
index 97b01276dd85356b7581161e936cfbee641e9bdf..480d09590798d6d63ae855e821e822944d90641f 100644
--- a/tools/telemetry/telemetry/core/backends/chrome/misc_web_contents_backend.py
+++ b/tools/telemetry/telemetry/core/backends/chrome/misc_web_contents_backend.py
@@ -3,6 +3,7 @@
 # found in the LICENSE file.
 
 from telemetry.core import exceptions
+from telemetry.core.backends.chrome_inspector import devtools_http
 from telemetry.core.backends.chrome_inspector import inspector_backend_list
 from telemetry.core.backends.chrome import oobe
 
@@ -21,9 +22,8 @@ class MiscWebContentsBackend(inspector_backend_list.InspectorBackendList):
     """Lightweight property to determine if the oobe webui is visible."""
     try:
       return bool(len(self))
-    except (exceptions.BrowserGoneException,
-            exceptions.BrowserConnectionGoneException,
-            exceptions.DevtoolsTargetCrashException):
+    except (exceptions.AppCrashException,
+            devtools_http.DevToolsClientConnectionError):
       return False
 
   def GetOobe(self):