Remove SWIGged use of BrowserProxy and TabProxy from PyAuto tests.

chrome/test/functional/fullscreen_mouselock.py

Index: chrome/test/functional/fullscreen_mouselock.py
diff --git a/chrome/test/functional/fullscreen_mouselock.py b/chrome/test/functional/fullscreen_mouselock.py
index 847b71ed147a0a216f830edb3d67646bc227e5ae..a9179f7a0bbddb18d778adcd50369275bdf6265f 100755
--- a/chrome/test/functional/fullscreen_mouselock.py
+++ b/chrome/test/functional/fullscreen_mouselock.py
@@ -419,7 +419,7 @@ class FullscreenMouselockTest(pyauto.PyUITest):
     """
     self.NavigateToURL(self.GetHttpURLForDataPath('google', 'google.html'))
     self._InitiateTabFullscreen()
-    self.GetBrowserWindow().GetTab().GoBack()
+    self.TabGoBack()
     self.assertFalse(
         self.IsFullscreenForTab(),
         msg='Tab fullscreen did not exit when navigating to a new page.')
@@ -457,7 +457,7 @@ class FullscreenMouselockTest(pyauto.PyUITest):
     lock_result = self._EnableAndReturnLockMouseResult()
     self.assertEqual(
         lock_result, 'success', msg='Mouse is not locked.')
-    self.GetBrowserWindow().GetTab().GoBack()
+    self.TabGoBack()
     self.assertFalse(
         self.IsMouseLocked(),
         msg='Mouse lock did not exit when navigating to the prev page.')