Non-web-accessible extension URLs should not load in non-extension processes

chrome/common/extensions/extension.h

Index: chrome/common/extensions/extension.h
diff --git a/chrome/common/extensions/extension.h b/chrome/common/extensions/extension.h
index 07df1a208b6e21dda2b94a9dcfa78bd1e5cebe85..e4932061f63b8db7137d3d0c2a285ad853275777 100644
--- a/chrome/common/extensions/extension.h
+++ b/chrome/common/extensions/extension.h
@@ -51,6 +51,9 @@ class APIPermissionSet;
 class PermissionSet;
 
 // Represents a Chrome extension.
+// Once created, an Extension object is immutable, with the exception of its
+// RuntimeData. This makes it safe to use on any thread, since access to the
+// RuntimeData is protected by a lock.
 class Extension : public base::RefCountedThreadSafe<Extension> {
  public:
   struct ManifestData;