[Telemetry] Set user agent through Network.setUserAgentOverride instead of --user-agent.

tools/telemetry/telemetry/tab_backend.py

Index: tools/telemetry/telemetry/tab_backend.py
diff --git a/tools/telemetry/telemetry/tab_backend.py b/tools/telemetry/telemetry/tab_backend.py
index f398a1462eba8bca384d24f2db0b8fcb589bd45a..8e5c4e06dc0ba3394de3f7fee22b9992b7984b5a 100644
--- a/tools/telemetry/telemetry/tab_backend.py
+++ b/tools/telemetry/telemetry/tab_backend.py
@@ -12,6 +12,7 @@ from telemetry import inspector_runtime
 from telemetry import inspector_timeline
 from telemetry import png_bitmap
 from telemetry import tab_crash_exception
+from telemetry import user_agent
 from telemetry import util
 from telemetry import websocket
 
@@ -44,6 +45,11 @@ class TabBackend(object):
     self._cur_socket_timeout = 0
     self._next_request_id = 0
 
+    user_agent_string = user_agent.GetUserAgentFromType(
+        self._browser_backend.options.browser_user_agent_type)
+    if user_agent_string is not None:

[bulach, 2013/01/18 20:44:04]

nit: s/is not None//

+      self._page.SetUserAgent(user_agent_string)
+
   def Disconnect(self):
     for _, handlers in self._domain_handlers.items():
       _, will_close_handler = handlers