Do not show shelf or top chrome hints while in Ash immersive mode

ash/common/shelf/shelf_constants.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/common/shelf/shelf_constants.h"
 
 #include "ash/common/material_design/material_design_controller.h"
 #include "base/logging.h"
 #include "third_party/skia/include/core/SkColor.h"
 
@@ skipping 13 matching lines @@
 const SkColor kShelfIconColor = SK_ColorWHITE;
 const int kOverflowButtonSize = 32;
 const int kOverflowButtonCornerRadius = 2;
 const int kAppListButtonRadius = kOverflowButtonSize / 2;
 
 int GetShelfConstant(ShelfConstant shelf_constant) {
   const int kShelfBackgroundAlpha[] = {204, 204, 153};
   const int kShelfSize[] = {47, 47, 48};
   const int kShelfButtonSpacing[] = {10, 10, 16};
   const int kShelfButtonSize[] = {44, 44, 48};
-  const int kShelfInsetsForAutoHide[] = {3, 3, 0};
+  const int kShelfInsetsForAutoHide[] = {3, 0, 0};
 
   const int mode = MaterialDesignController::GetMode();
   DCHECK(mode >= MaterialDesignController::NON_MATERIAL &&
          mode <= MaterialDesignController::MATERIAL_EXPERIMENTAL);
 
   switch (shelf_constant) {
     case SHELF_BACKGROUND_ALPHA:
       return kShelfBackgroundAlpha[mode];
     case SHELF_SIZE:
       return kShelfSize[mode];
     case SHELF_BUTTON_SPACING:
       return kShelfButtonSpacing[mode];
     case SHELF_BUTTON_SIZE:
       return kShelfButtonSize[mode];
     case SHELF_INSETS_FOR_AUTO_HIDE:
       return kShelfInsetsForAutoHide[mode];
   }
   NOTREACHED();
   return 0;
 }
 
 }  // namespace ash