ChromeLauncherController uses nullptr, not null

We now use nullptr instead of null
https://google.github.io/styleguide/cppguide.html#0_and_nullptr/NULL

Change-Id: If1dfab9f77ca09f3d5a5cbe922646886d7517ec0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2089186
Auto-Submit: Eric Willigers <ericwilligers@chromium.org>
Reviewed-by: Nancy Wang <nancylingwang@chromium.org>
Commit-Queue: Eric Willigers <ericwilligers@chromium.org>
Cr-Commit-Position: refs/heads/master@{#747538}

chrome/browser/ui/ash/launcher/chrome_launcher_controller.cc

@@ -263,7 +263,7 @@ ChromeLauncherController::ChromeLauncherController(Profile* profile,
   MultiUserWindowManagerHelper::CreateInstance();
 
   // On Chrome OS using multi profile we want to switch the content of the shelf
-  // with a user change. Note that for unit tests the instance can be NULL.
+  // with a user change. Note that for unit tests the instance can be nullptr.
   if (SessionControllerClientImpl::IsMultiProfileAvailable()) {
     user_switch_observer_.reset(
         new ChromeLauncherControllerUserSwitchObserver(this));

chrome/browser/ui/ash/launcher/chrome_launcher_controller_browsertest.cc

@@ -2011,7 +2011,7 @@ IN_PROC_BROWSER_TEST_F(ShelfAppBrowserTest, DISABLED_V1AppNavigation) {
   EXPECT_EQ(ash::STATUS_RUNNING, shelf_model()->ItemByID(id)->status);
 
   // Find the browser which holds our app.
-  Browser* app_browser = NULL;
+  Browser* app_browser = nullptr;
   const BrowserList* browser_list = BrowserList::GetInstance();
   for (BrowserList::const_reverse_iterator it =
            browser_list->begin_last_active();

chrome/browser/ui/ash/launcher/chrome_launcher_controller_unittest.cc

@@ -1060,7 +1060,7 @@ class WebContentsDestroyedWatcher : public content::WebContentsObserver {
   explicit WebContentsDestroyedWatcher(content::WebContents* web_contents)
       : content::WebContentsObserver(web_contents),
         message_loop_runner_(new content::MessageLoopRunner) {
-    EXPECT_TRUE(web_contents != NULL);
+    EXPECT_TRUE(web_contents != nullptr);
   }
   ~WebContentsDestroyedWatcher() override {}
 
@@ -2993,7 +2993,7 @@ TEST_F(ChromeLauncherControllerTest, Policy) {
 
   // Removing |extension1_| from the policy should not be reflected in the
   // launcher and pin will exist.
-  policy_value.Remove(0, NULL);
+  policy_value.Remove(0, nullptr);
   profile()->GetTestingPrefService()->SetManagedPref(
       prefs::kPolicyPinnedLauncherApps, policy_value.CreateDeepCopy());
   EXPECT_EQ("Chrome, App1, App2", GetPinnedAppStatus());