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

chrome/test/functional/chromeos_security.py

Index: chrome/test/functional/chromeos_security.py
diff --git a/chrome/test/functional/chromeos_security.py b/chrome/test/functional/chromeos_security.py
index 40be9f6e9d5be65365886aafd0790ec77d2b9238..5ecd2ac54c6591d0a5729e2a1bdf71b6b92451d0 100644
--- a/chrome/test/functional/chromeos_security.py
+++ b/chrome/test/functional/chromeos_security.py
@@ -169,8 +169,7 @@ class ChromeosSecurity(pyauto.PyUITest):
             file_name in [x['crx_file'] for x in self._bundled_crx_baseline],
             msg='Unexpected CRX file: ' + file_name)
         crx_file = os.path.join(self._bundled_crx_directory, file_name)
-        self.assertTrue(self.InstallExtension(crx_file, False),
-                        msg='Extension install failed: %s' % crx_file)
+        self.InstallExtension(crx_file)
 
     # Verify that the permissions information in the baseline matches the
     # permissions associated with the installed bundled CRX extensions.
@@ -182,8 +181,7 @@ class ChromeosSecurity(pyauto.PyUITest):
     for file_name in os.listdir(self._bundled_crx_directory):
       if file_name.endswith('.crx'):
         crx_file = os.path.join(self._bundled_crx_directory, file_name)
-        self.assertTrue(self.InstallExtension(crx_file, False),
-                        msg='Extension install failed: %s' % crx_file)
+        self.InstallExtension(crx_file)
 
     # Ensure that the set of installed extension names precisely matches the
     # baseline.