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 6fc1165cb7e920ddf21d0f58e4b1197c80578772..d650ab508ea54339645cbdd5bc100084e3621cef 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;