Show modal dialog to tell users that the profile is managed when it's the case.

chrome/browser/extensions/api/developer_private/developer_private_api.h

Index: chrome/browser/extensions/api/developer_private/developer_private_api.h
diff --git a/chrome/browser/extensions/api/developer_private/developer_private_api.h b/chrome/browser/extensions/api/developer_private/developer_private_api.h
index ce86299ef7a867f1d926474facc51f55bba8264d..00a3d5454927b63bfc3e079194395e3b075bb997 100644
--- a/chrome/browser/extensions/api/developer_private/developer_private_api.h
+++ b/chrome/browser/extensions/api/developer_private/developer_private_api.h
@@ -361,6 +361,18 @@ class DeveloperPrivateGetStringsFunction : public SyncExtensionFunction {
    virtual bool RunImpl() OVERRIDE;
 };
 
+class DeveloperPrivateIsProfileManagedFunction : public SyncExtensionFunction {
+  public:
+   DECLARE_EXTENSION_FUNCTION("developerPrivate.isProfileManaged",
+                              DEVELOPERPRIVATE_ISPROFILEMANAGED);
+
+  protected:
+   virtual ~DeveloperPrivateIsProfileManagedFunction();
+
+   // ExtensionFunction
+   virtual bool RunImpl() OVERRIDE;
+};
+
 class DeveloperPrivateExportSyncfsFolderToLocalfsFunction
     : public AsyncExtensionFunction {
   public: