Convert Pass()→std::move() in //chrome/browser/extensions

☃

BUG=557422
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Review URL: https://codereview.chromium.org/1549233002

Cr-Commit-Position: refs/heads/master@{#366911}
diff --git a/chrome/browser/extensions/extension_util.cc b/chrome/browser/extensions/extension_util.cc
index 5b4bfd48..4406eb9 100644
--- a/chrome/browser/extensions/extension_util.cc
+++ b/chrome/browser/extensions/extension_util.cc
@@ -345,7 +345,7 @@
       NULL);  // Don't set bool if exists.
   dict->SetString("icon", icon.spec());
 
-  return dict.Pass();
+  return dict;
 }
 
 const gfx::ImageSkia& GetDefaultAppIcon() {