[chromedriver] Fix 3 bugs about web view, window handle and target window.

chrome/test/chromedriver/run_py_tests.py

Index: chrome/test/chromedriver/run_py_tests.py
diff --git a/chrome/test/chromedriver/run_py_tests.py b/chrome/test/chromedriver/run_py_tests.py
index 8dcecfbfee3c3045a3852af1c962d7ab4b9ea1ae..9f9a8fc834a42a4f4e0d71a7489ca461656090b0 100755
--- a/chrome/test/chromedriver/run_py_tests.py
+++ b/chrome/test/chromedriver/run_py_tests.py
@@ -154,11 +154,9 @@ class ChromeDriverTest(ChromeDriverBaseTest):
     while time.time() < timeout:
       new_handles = self._driver.GetWindowHandles()
       if len(new_handles) > len(old_handles):
-        for old_handle in old_handles:
-          self.assertTrue(old_handle in new_handles)
-          new_handles.remove(old_handle)
-        self.assertTrue(len(new_handles))
-        return new_handles[0]
+        for index, old_handle in enumerate(old_handles):
+          self.assertEquals(old_handle, new_handles[index])
+        return new_handles[len(old_handles)]
       time.sleep(0.01)
     return None