Rename confusing variable
Rename confusing variable

PolymerLabs/playground-elements,google/playground-elements,PolymerLabs/code-sample-editor,PolymerLabs/code-sample-editor-package,PolymerLabs/playground-elements,PolymerLabs/code-sample-editor,PolymerLabs/code-sample-editor-package,google/playground-elements,PolymerLabs/playground-elements,PolymerLabs/code-sample-editor-package,google/playground-elements,PolymerLabs/code-sample-editor