Fixed search of cdb.exe.

It was being searched for under the name 'cdb'. Fixing this gets
symbolized stack traces working again on Windows.

BUG=399431

Review URL: https://codereview.chromium.org/436723002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@287047 0039d316-1c4b-4281-b951-d872f2087c98

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

@@ -119,7 +119,7 @@ def _GetCdbPath(self):
                      'x64'),
     )
     for possible_path in possible_paths:
-      app_path = os.path.join(possible_path, 'cdb')
+      app_path = os.path.join(possible_path, 'cdb.exe')
       app_path = path.FindInstalledWindowsApplication(app_path)
       if app_path:
         return app_path