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 9004094dfd5535d7f0a0b649d45581a6f4362a8d..e9b88ebcb1032e76683a69d16466444ab2353e72 100644
--- a/chrome/common/extensions/extension.h
+++ b/chrome/common/extensions/extension.h
@@ -56,6 +56,9 @@ struct ActionInfo;
 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;