[gnome-shell-extensions] Fix a number of undeclared variable warnings

[Giovanni Campagna <gcampagna src gnome org>]

commit 2e5d8c738418b65609a00a47bba26761ecec6b58
Author: Giovanni Campagna <gcampagn redhat com>
Date:   Tue Jul 30 13:23:47 2013 +0200

    Fix a number of undeclared variable warnings
    
    "for (prop in object)" needs a "var prop" before, or it declares
    a global property.

 extensions/alternate-tab/extension.js           |    2 ++
 extensions/native-window-placement/extension.js |    2 ++
 extensions/window-list/extension.js             |    2 ++
 3 files changed, 6 insertions(+), 0 deletions(-)
---
diff --git a/extensions/alternate-tab/extension.js b/extensions/alternate-tab/extension.js
index c3ef698..8b4cc74 100644
--- a/extensions/alternate-tab/extension.js
+++ b/extensions/alternate-tab/extension.js
@@ -54,6 +54,8 @@ function enable() {
 }
 
 function disable() {
+    var prop;
+
     setKeybinding('switch-applications', Lang.bind(Main.wm, Main.wm._startAppSwitcher));
     setKeybinding('switch-group', Lang.bind(Main.wm, Main.wm._startAppSwitcher));
     setKeybinding('switch-applications-backward', Lang.bind(Main.wm, Main.wm._startAppSwitcher));
diff --git a/extensions/native-window-placement/extension.js b/extensions/native-window-placement/extension.js
index 2fea947..b0dcc5d 100644
--- a/extensions/native-window-placement/extension.js
+++ b/extensions/native-window-placement/extension.js
@@ -480,6 +480,8 @@ function removeInjection(object, injection, name) {
 }
 
 function disable() {
+    var i;
+
     for (i in workspaceInjections)
         removeInjection(Workspace.Workspace.prototype, workspaceInjections, i);
     for (i in winInjections)
diff --git a/extensions/window-list/extension.js b/extensions/window-list/extension.js
index d5ac261..2980fbe 100644
--- a/extensions/window-list/extension.js
+++ b/extensions/window-list/extension.js
@@ -842,6 +842,8 @@ function enable() {
 }
 
 function disable() {
+    var prop;
+
     if (!windowList)
         return;