Allow chromedriver to install an extension and get all installed extension IDs.

chrome/test/functional/ntp.py

Index: chrome/test/functional/ntp.py
diff --git a/chrome/test/functional/ntp.py b/chrome/test/functional/ntp.py
index 3086ee6df285fcb985784fa582f0bd0c09cb7622..b0344af6f72114a3983360272f514156d81ef52b 100644
--- a/chrome/test/functional/ntp.py
+++ b/chrome/test/functional/ntp.py
@@ -405,11 +405,10 @@ class NTPTest(pyauto.PyUITest):
     # Install a regular extension and a theme.
     ext_crx_file = os.path.abspath(os.path.join(self.DataDir(), 'extensions',
                                                 'page_action.crx'))
-    self.assertTrue(self.InstallExtension(ext_crx_file, False),
-                    msg='Extension install failed.')
+    self.InstallExtension(ext_crx_file)
     theme_crx_file = os.path.abspath(os.path.join(self.DataDir(), 'extensions',
                                                   'theme.crx'))
-    self.assertTrue(self.SetTheme(theme_crx_file), msg='Theme install failed.')
+    self.SetTheme(theme_crx_file)
     # Verify that no apps are listed on the NTP except for the Web Store.
     app_info = self.GetNTPApps()
     self._VerifyAppInfo(app_info, self._EXPECTED_DEFAULT_APPS)