DevTools: mark setTouchEmulationEnabled as handled in browser.

Source/devtools/protocol.json

 {
     "version": { "major": "1", "minor": "1" },
     "domains": [{
         "domain": "Inspector",
         "hidden": true,
         "types": [],
         "commands": [
             {
                 "name": "enable",
                 "description": "Enables inspector domain notifications."
@@ skipping 454 matching lines @@
                 "description": "Clears the overridden Device Orientation.",
                 "redirect": "DeviceOrientation",
                 "hidden": true
             },
             {
                 "name": "setTouchEmulationEnabled",
                 "parameters": [
                     { "name": "enabled", "type": "boolean", "description": "Whether the touch event emulation should be enabled." }
                 ],
                 "description": "Toggles mouse event-based touch event emulation.",
-                "hidden": true
+                "hidden": true,
+                "handlers": ["browser", "renderer"]
             },
             {
                 "name": "setEmulatedMedia",
                 "parameters": [
                     { "name": "media", "type": "string", "description": "Media type to emulate. Empty string disables the override." }
                 ],
                 "description": "Emulates the given media for CSS media queries.",
                 "hidden": true
             },
             {
@@ skipping 3809 matching lines @@
             {
                 "name": "dataAvailable",
                 "parameters": [
                     {"name": "value", "type": "array", "items": { "$ref": "PowerEvent" }, "description": "List of power events." }
                 ],
                 "handlers": ["browser", "frontend"]
             }
         ]
     }]
 }