Remove SWIGged use of BrowserProxy and TabProxy from PyAuto tests.

chrome/test/functional/instant.py

Index: chrome/test/functional/instant.py
diff --git a/chrome/test/functional/instant.py b/chrome/test/functional/instant.py
index 19fbae4084221a73ac674b568a35ea693f076e26..66817f5c74821ff56d1c669926b7c483d201d8bd 100755
--- a/chrome/test/functional/instant.py
+++ b/chrome/test/functional/instant.py
@@ -167,14 +167,14 @@ class InstantTest(pyauto.PyUITest):
     self.NavigateToURL('about:blank');
     self._BringUpInstant()
     self.AppendTab(pyauto.GURL('chrome://newtab'))
-    self.GetBrowserWindow(0).GetTab(1).Close(True)
+    self.CloseTab(tab_index=1)
     self.assertEqual(self.GetActiveTabTitle(), 'about:blank')
 
   def testExtnPageCanDismissInstant(self):
     """Test that instant preview is dismissed by extension page."""
     self._BringUpInstant()
     self.AppendTab(pyauto.GURL('chrome://extensions'))
-    self.GetBrowserWindow(0).GetTab(1).Close(True)
+    self.CloseTab(tab_index=1)
     self.assertEqual(self.GetActiveTabTitle(), 'New Tab')
 
   def testNewWindowCanDismissInstant(self):