var xhr = new XMLHttpRequest(),
	stylesheet = 'stable.css',
	stableVersion = 56;

if (/Chrome\/(\d\d)/.exec(navigator.userAgent)[1] > stableVersion) {
	stylesheet = 'canary.css';
}

xhr.open("GET", "/" + stylesheet, false);
xhr.send();
chrome.devtools.panels.applyStyleSheet(xhr.responseText);

@@ -75,9 +75,9 @@
  = 5
-6
+7
 ;%0A%0Ai

Bump stable version