DevTools: get rid of Element.prototype.removeMatchingStyleClasses

This method encourages className crafting and runs unexpectedly long.

BUG=316092
NOTRY=true

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=180163

Review URL: https://codereview.chromium.org/466703002

git-svn-id: svn://svn.chromium.org/blink/trunk@180172 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/devtools/front_end/networkLogView.css

@@ -363,7 +363,7 @@
 /* Resource categories */
 
 
-.resource-cached .network-graph-bar {
+.network-graph-bar.cached {
     background: hsl(0, 0%, 90%);
     box-shadow: inset 0 1px 1px 0px rgba(255, 255, 255, 0.8),
                 inset 0 0 0 2px hsl(0, 0%, 73%),