Move Extension Location and Type enums to Manifest, and move InstallWarning to its own file.

chrome/browser/background/background_application_list_model_unittest.cc

Index: chrome/browser/background/background_application_list_model_unittest.cc
diff --git a/chrome/browser/background/background_application_list_model_unittest.cc b/chrome/browser/background/background_application_list_model_unittest.cc
index ef775b892a2ddfe57dd55f7128ab69a8ca3ee14b..9f8645de70056d4abf639d342949a2428f0ec5e6 100644
--- a/chrome/browser/background/background_application_list_model_unittest.cc
+++ b/chrome/browser/background/background_application_list_model_unittest.cc
@@ -73,7 +73,7 @@ static scoped_refptr<Extension> CreateExtension(const std::string& name,
   std::string error;
   scoped_refptr<Extension> extension = Extension::Create(
       bogus_file_path().AppendASCII(name),
-      Extension::INVALID,
+      extensions::Manifest::INVALID_LOCATION,
       manifest,
       Extension::NO_FLAGS,
       &error);