Fix app_list_demo compile and build in gn_all

I ran 'autoninja -c out/Default' and hit compile errors in app_list_demo.
AFAICT, app_list_demo is not built in gn_all (there's no path between them):
  gn path -C out/Default/ :gn_all //ui/app_list:app_list_demo
So, this target probably isn't built by the CQ and thus can break easily.

I fixed the errors and added the target to gn_all.

Bug: NONE
Test: 'autoninja -c out/Default' works; app_list_demo is built by bots
Change-Id: Ia1fb66e182a1dca2f1cd5abc236b20f98a3649a6
Reviewed-on: https://chromium-review.googlesource.com/902742Reviewed-by: Xiyuan Xia <xiyuan@chromium.org>
Reviewed-by: Nico Weber <thakis@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#534554}

BUILD.gn

@@ -369,6 +369,7 @@ group("gn_all") {
       "//chromeos:chromeos_unittests",
       "//chromeos/components:chromeos_components_unittests",
       "//components/session_manager/core",
+      "//ui/app_list:app_list_demo",
       "//ui/app_list:app_list_unittests",
       "//ui/app_list/presenter:app_list_presenter_unittests",
       "//ui/arc:ui_arc_unittests",

ui/app_list/demo/app_list_demo_views.cc

@@ -7,7 +7,6 @@
 #include <memory>
 
 #include "base/bind.h"
-#include "base/command_line.h"
 #include "base/macros.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
@@ -22,8 +21,6 @@
 
 namespace {
 
-class AppListDemoService;
-
 // Number of dummy apps to populate in the app list.
 const int kInitialItems = 20;
 
@@ -57,7 +54,6 @@ app_list::AppListView* DemoAppListViewDelegate::InitView(
   app_list::AppListView::InitParams params;
   params.parent = container;
   view_->Initialize(params);
-  view_->MaybeSetAnchorPoint(gfx::Point(300, 300));
 
   // Populate some apps.
   GetTestModel()->PopulateApps(kInitialItems);
@@ -82,7 +78,8 @@ void DemoAppListViewDelegate::ViewClosing() {
   base::RunLoop::QuitCurrentWhenIdleDeprecated();
 }
 
-void ShowAppList(gfx::NativeWindow window_context) {
+void ShowAppList(content::BrowserContext* browser_context,
+                 gfx::NativeWindow window_context) {
   DemoAppListViewDelegate* delegate = new DemoAppListViewDelegate;
   app_list::AppListView* view = delegate->InitView(window_context);
   view->GetWidget()->Show();
@@ -93,7 +90,6 @@ void ShowAppList(gfx::NativeWindow window_context) {
 
 int main(int argc, const char** argv) {
   ui::ViewsContentClient views_content_client(argc, argv);
-
   views_content_client.set_task(base::Bind(&ShowAppList));
   return views_content_client.RunMain();
 }