Made launcher hidden when kicking off chrome in app mode.

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

Index: chrome/browser/ui/ash/launcher/chrome_launcher_controller_per_app.cc
diff --git a/chrome/browser/ui/ash/launcher/chrome_launcher_controller_per_app.cc b/chrome/browser/ui/ash/launcher/chrome_launcher_controller_per_app.cc
index 207f51b85e7b6d1004f3e80a85c0bf6f779317c6..4967525340af39584a953bf6400cad757db94b32 100644
--- a/chrome/browser/ui/ash/launcher/chrome_launcher_controller_per_app.cc
+++ b/chrome/browser/ui/ash/launcher/chrome_launcher_controller_per_app.cc
@@ -13,6 +13,7 @@
 #include "base/command_line.h"
 #include "base/string_number_conversions.h"
 #include "base/values.h"
+#include "chrome/browser/app_mode/app_mode_utils.h"
 #include "chrome/browser/defaults.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/extension_system.h"
@@ -45,6 +46,7 @@
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/browser/web_applications/web_app.h"
 #include "chrome/common/chrome_notification_types.h"
+#include "chrome/common/chrome_switches.h"
 #include "chrome/common/extensions/extension.h"
 #include "chrome/common/extensions/extension_resource.h"
 #include "chrome/common/pref_names.h"
@@ -631,6 +633,10 @@ Profile* ChromeLauncherControllerPerApp::profile() {
 ash::ShelfAutoHideBehavior
     ChromeLauncherControllerPerApp::GetShelfAutoHideBehavior(
         aura::RootWindow* root_window) const {
+  // Don't show the shelf in app mode.
+  if (chrome::IsRunningInAppMode())
+    return ash::SHELF_AUTO_HIDE_ALWAYS_HIDDEN;
+
   // See comment in |kShelfAlignment| as to why we consider two prefs.
   const std::string behavior_value(
       GetPrefForRootWindow(profile_->GetPrefs(),
@@ -1202,6 +1208,11 @@ void ChromeLauncherControllerPerApp::SetShelfAutoHideBehaviorPrefs(
     case ash::SHELF_AUTO_HIDE_BEHAVIOR_NEVER:
       value = ash::kShelfAutoHideBehaviorNever;
       break;
+    case ash::SHELF_AUTO_HIDE_ALWAYS_HIDDEN:
+      // This one should not be a valid preference option for now. We only want
+      // to completely hide it when we run app mode.
+      NOTREACHED();
+      return;
   }
 
   UpdatePerDisplayPref(