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

chrome/browser/themes/theme_syncable_service_unittest.cc

Index: chrome/browser/themes/theme_syncable_service_unittest.cc
diff --git a/chrome/browser/themes/theme_syncable_service_unittest.cc b/chrome/browser/themes/theme_syncable_service_unittest.cc
index b72750e80fea814aaccc351253d9c44b1f6ffdc7..2f84f1e9ed4aa4063112b089746523df8396b766 100644
--- a/chrome/browser/themes/theme_syncable_service_unittest.cc
+++ b/chrome/browser/themes/theme_syncable_service_unittest.cc
@@ -138,7 +138,7 @@ scoped_refptr<extensions::Extension> MakeThemeExtension(
   string error;
   scoped_refptr<extensions::Extension> extension =
       extensions::Extension::Create(
-          extension_path, extensions::Extension::EXTERNAL_PREF_DOWNLOAD, source,
+          extension_path, extensions::Manifest::EXTERNAL_PREF_DOWNLOAD, source,
           extensions::Extension::NO_FLAGS, &error);
   EXPECT_TRUE(extension);
   EXPECT_EQ("", error);