Extensions-related fixups for scoped_refptr conversion operator removal.

chrome/browser/extensions/extension_install_checker.h

Index: chrome/browser/extensions/extension_install_checker.h
diff --git a/chrome/browser/extensions/extension_install_checker.h b/chrome/browser/extensions/extension_install_checker.h
index 2841e833adb2e1e8d6adbd0e312611f53cfe9eb1..17a517bd9c87598df716aa7db411727436d031f3 100644
--- a/chrome/browser/extensions/extension_install_checker.h
+++ b/chrome/browser/extensions/extension_install_checker.h
@@ -56,8 +56,10 @@ class ExtensionInstallChecker {
 
   Profile* profile() const { return profile_; }
 
-  scoped_refptr<const Extension> extension() { return extension_; }
-  void set_extension(const Extension* extension) { extension_ = extension; }
+  const scoped_refptr<const Extension>& extension() { return extension_; }
+  void set_extension(const scoped_refptr<const Extension>& extension) {
+    extension_ = extension;
+  }
 
   // Returns true if any checks are currently running.
   bool is_running() const { return running_checks_ != 0; }