Fixes a bug where touch device scripts were not cleared on exit of device mode in devtools.

Source/devtools/front_end/emulation/OverridesSupport.js

Index: Source/devtools/front_end/emulation/OverridesSupport.js
diff --git a/Source/devtools/front_end/emulation/OverridesSupport.js b/Source/devtools/front_end/emulation/OverridesSupport.js
index ddfd646967b9c4d1f89d1a6a420b8df30ee30eac..3a1588e039bb2fd015b61c5452194dec1dd7b41f 100644
--- a/Source/devtools/front_end/emulation/OverridesSupport.js
+++ b/Source/devtools/front_end/emulation/OverridesSupport.js
@@ -710,6 +710,9 @@ WebInspector.OverridesSupport.prototype = {
         var symbol = WebInspector.OverridesSupport._touchEventsScriptIdSymbol;
 
         if (emulationEnabled && target[symbol] !== -1) {
+            if (typeof target[symbol] !== "undefined")
+                target.pageAgent().removeScriptToEvaluateOnLoad(target[symbol]);

[dgozman, 2015/08/25 18:02:09]

This is getting messy. Could you please rewrite this whole section to:
- always remove the old script;
- add the new one if necessary.

+
             target[symbol] = -1;
             target.pageAgent().addScriptToEvaluateOnLoad("(" + injectedFunction.toString() + ")()", scriptAddedCallback);
         } else {