DevTools: refactoring to clean up InspectorStyleSheet header.

BUG=

Review URL: https://codereview.chromium.org/201173003

git-svn-id: svn://svn.chromium.org/blink/trunk@169342 bbb929c8-8fbe-4397-9dbb-9b2b20218538
DevTools: Fix reveal uiSourceCode in navigator context menu action.

R=pfeldman

Review URL: https://codereview.chromium.org/197213010

git-svn-id: svn://svn.chromium.org/blink/trunk@169343 bbb929c8-8fbe-4397-9dbb-9b2b20218538