Introduce LaunchParams struct for opening chrome apps.

chrome/browser/ui/panels/panel_app_browsertest.cc

Index: chrome/browser/ui/panels/panel_app_browsertest.cc
diff --git a/chrome/browser/ui/panels/panel_app_browsertest.cc b/chrome/browser/ui/panels/panel_app_browsertest.cc
index f8cb966bfaa46bef16fa11c1485708d525858e7a..66090fbc4ed1e50ffb14f2f409310532bd6ae9ca 100644
--- a/chrome/browser/ui/panels/panel_app_browsertest.cc
+++ b/chrome/browser/ui/panels/panel_app_browsertest.cc
@@ -52,14 +52,10 @@ class PanelAppBrowserTest : public ExtensionBrowserTest {
     PanelManager* manager = PanelManager::GetInstance();
     int panel_count = manager->num_panels();
 
-    application_launch::OpenApplication(
-        browser()->profile(),
-        extension,
-        // Overriding manifest to open in a panel.
-        extension_misc::LAUNCH_PANEL,
-        GURL(),
-        NEW_WINDOW,
-        NULL);
+    // Overriding manifest to launch in a panel.
+    application_launch::OpenApplication(application_launch::LaunchParams(
+            browser()->profile(), extension, extension_misc::LAUNCH_PANEL,
+            NEW_WINDOW));
 
     // Now we have a new browser instance.
     EXPECT_EQ(panel_count + 1, manager->num_panels());