Fix a regression where browser.Start() was introduced in telemetry.

BUG=chromium:266980

TEST=manual, autotests

Change-Id: I60b2da99f6462228aa2d3d116fdd117b73622fc7
Reviewed-on: https://gerrit.chromium.org/gerrit/64378
Reviewed-by: Simran Basi <sbasi@chromium.org>
Commit-Queue: Achuith Bhandarkar <achuith@chromium.org>
Tested-by: Achuith Bhandarkar <achuith@chromium.org>
diff --git a/client/common_lib/cros/chrome.py b/client/common_lib/cros/chrome.py
index c7a37af..813c063 100644
--- a/client/common_lib/cros/chrome.py
+++ b/client/common_lib/cros/chrome.py
@@ -32,6 +32,7 @@
 
         browser_to_create = browser_finder.FindBrowser(options)
         self._browser = browser_to_create.Create()
+        self._browser.Start()
 
 
     def __enter__(self):