Bug 1346647 - Fix RDM button for undocked toolbox. r=ochameau

MozReview-Commit-ID: 15axErkUY1E

--HG--
extra : rebase_source : f256d6e12e6e688b4fb89e4cd6e80e1ba0f88edf

devtools/client/definitions.js

@@ -511,11 +511,10 @@ exports.ToolboxButtons = [
                       osString == "Darwin" ? "Cmd+Opt+M" : "Ctrl+Shift+M"),
     isTargetSupported: target => target.isLocalTab,
     onClick(event, toolbox) {
-      let browserWindow = toolbox.win.top;
+      let tab = toolbox.target.tab;
-      ResponsiveUIManager.handleGcliCommand(browserWindow,
+      let browserWindow = tab.ownerDocument.defaultView;
-        browserWindow.gBrowser.selectedTab,
+      ResponsiveUIManager.handleGcliCommand(browserWindow, tab,
-        "resize toggle",
+        "resize toggle", null);
-        null);
     },
     isChecked(toolbox) {
       if (!toolbox.target.tab) {