Make runtime.reload() work with component extensions.

extensions/common/extension.h

Index: extensions/common/extension.h
diff --git a/extensions/common/extension.h b/extensions/common/extension.h
index a429d59286d67ee4eaba77a59dd633c9236ca02a..47f85f33ff942bd704b47558d45061217ebb2148 100644
--- a/extensions/common/extension.h
+++ b/extensions/common/extension.h
@@ -62,9 +62,9 @@ class Extension : public base::RefCountedThreadSafe<Extension> {
     // An external extension that the user uninstalled. We should not reinstall
     // such extensions on startup.
     EXTERNAL_EXTENSION_UNINSTALLED,
-    // Special state for component extensions, since they are always loaded by
-    // the component loader, and should never be auto-installed on startup.
-    ENABLED_COMPONENT,
+    // DEPRECATED: Special state for component extensions.
+    // Maintained as a placeholder since states may be stored to disk.
+    ENABLED_COMPONENT_DEPRECATED,
     NUM_STATES
   };