DevTools: fix protocol.json Page.colorPicked event

The event should report DOM.RGBA color instead of string.

R=pfeldman@chromium.org, pfeldman

Review URL: https://codereview.chromium.org/478943002

git-svn-id: svn://svn.chromium.org/blink/trunk@180409 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/devtools/protocol.json

@@ -686,7 +686,7 @@
                 "name": "colorPicked",
                 "description": "Fired when a color has been picked.",
                 "parameters": [
-                    { "name": "color", "type": "string", "description": "Color" }
+                    { "name": "color", "$ref": "DOM.RGBA", "description": "RGBA of the picked color." }
                 ],
                 "hidden": true,
                 "handlers": ["browser"]