Move chrome-specific calls to chromium.js

// FREEBIE

js/background.js

@@ -9,29 +9,11 @@
     };
 
     console.log('background page reloaded');
-    // register some chrome listeners
-    if (chrome.notifications) {
-        chrome.notifications.onClicked.addListener(function() {
-            extension.notification.clear();
-            Whisper.Notifications.onclick();
-        });
-        chrome.notifications.onButtonClicked.addListener(function() {
-            extension.notification.clear();
-            Whisper.Notifications.clear();
-            getInboxCollection().each(function(model) {
-                model.markRead();
-            });
-        });
-        chrome.notifications.onClosed.addListener(function(id, byUser) {
-            if (byUser) {
-                Whisper.Notifications.clear();
-            }
-        });
-    }
+    extension.notification.init();
 
     // Close and reopen existing windows
     var open = false;
-    chrome.app.window.getAll().forEach(function(appWindow) {
+    extension.windows.getAll().forEach(function(appWindow) {
         open = true;
         appWindow.close();
     });

js/chromium.js

@@ -105,6 +105,10 @@
             }
         },
 
+        getAll: function() {
+            return chrome.app.window.getAll();
+        },
+
         getViews: function() {
             if (chrome.extension) {
                 return chrome.extension.getViews();
@@ -214,6 +218,27 @@
 
     var notification_pending = Promise.resolve();
     extension.notification = {
+        init: function() {
+            // register some chrome listeners
+            if (chrome.notifications) {
+                chrome.notifications.onClicked.addListener(function() {
+                    extension.notification.clear();
+                    Whisper.Notifications.onclick();
+                });
+                chrome.notifications.onButtonClicked.addListener(function() {
+                    extension.notification.clear();
+                    Whisper.Notifications.clear();
+                    getInboxCollection().each(function(model) {
+                        model.markRead();
+                    });
+                });
+                chrome.notifications.onClosed.addListener(function(id, byUser) {
+                    if (byUser) {
+                        Whisper.Notifications.clear();
+                    }
+                });
+            }
+        },
         clear: function() {
             notification_pending = notification_pending.then(function() {
                 return new Promise(function(resolve) {