Remove implicit conversions from scoped_refptr to T* in chrome/browser/extensions/

This patch was generated by running the rewrite_scoped_refptr clang tool
on a Linux build.

BUG=110610

Review URL: https://codereview.chromium.org/508513002

Cr-Commit-Position: refs/heads/master@{#291844}
diff --git a/chrome/browser/extensions/extension_error_controller.cc b/chrome/browser/extensions/extension_error_controller.cc
index 8ae3154..cf2f07c7 100644
--- a/chrome/browser/extensions/extension_error_controller.cc
+++ b/chrome/browser/extensions/extension_error_controller.cc
@@ -119,7 +119,7 @@
   for (ExtensionSet::const_iterator iter = enabled_set.begin();
        iter != enabled_set.end();
        ++iter) {
-    const Extension* extension = *iter;
+    const Extension* extension = iter->get();
 
     // Skip for extensions that have pending updates. They will be checked again
     // once the pending update is finished.