Revert of Create vector icon resource directory specific to Chrome.

chrome/browser/ui/cocoa/toolbar/app_toolbar_button.mm

 // Copyright 2016 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.
 
 #import "chrome/browser/ui/cocoa/toolbar/app_toolbar_button.h"
 
 #include "base/macros.h"
-#include "chrome/app/vector_icons/vector_icons.h"
 #import "chrome/browser/ui/cocoa/themed_window.h"
 #import "chrome/browser/ui/cocoa/view_id_util.h"
 #include "ui/base/material_design/material_design_controller.h"
 #include "ui/gfx/color_palette.h"
 
 @interface AppToolbarButton ()
 - (void)commonInit;
 @end
 
 @implementation AppToolbarButton
 
 - (instancetype)initWithFrame:(NSRect)frame {
   if ((self = [super initWithFrame:frame])) {
     [self commonInit];
   }
   return self;
 }
 
 - (void)awakeFromNib {
   [self commonInit];
 }
 
 - (void)commonInit {
   view_id_util::SetID(self, VIEW_ID_APP_MENU);
   severity_ = AppMenuIconController::Severity::NONE;
   type_ = AppMenuIconController::IconType::NONE;
 }
 
-- (const gfx::VectorIcon*)vectorIcon {
+- (gfx::VectorIconId)vectorIconId {
   switch (type_) {
     case AppMenuIconController::IconType::NONE:
       DCHECK_EQ(severity_, AppMenuIconController::Severity::NONE);
-      return &kBrowserToolsIcon;
+      return gfx::VectorIconId::BROWSER_TOOLS;
     case AppMenuIconController::IconType::UPGRADE_NOTIFICATION:
-      return &kBrowserToolsUpdateIcon;
+      return gfx::VectorIconId::BROWSER_TOOLS_UPDATE;
     case AppMenuIconController::IconType::GLOBAL_ERROR:
     case AppMenuIconController::IconType::INCOMPATIBILITY_WARNING:
-      return &kBrowserToolsErrorIcon;
+      return gfx::VectorIconId::BROWSER_TOOLS_ERROR;
   }
 
-  return nullptr;
+  return gfx::VectorIconId::VECTOR_ICON_NONE;
 }
 
 - (SkColor)vectorIconColor:(BOOL)themeIsDark {
   switch (severity_) {
     case AppMenuIconController::Severity::NONE:
       return themeIsDark ? SK_ColorWHITE : gfx::kChromeIconGrey;
       break;
 
     case AppMenuIconController::Severity::LOW:
       return themeIsDark ? gfx::kGoogleGreen300 : gfx::kGoogleGreen700;
@@ skipping 17 matching lines @@
       shouldAnimate:(BOOL)shouldAnimate {
   if (severity != severity_ || type != type_) {
     severity_ = severity;
     type_ = type;
     // Update the button state images with the new severity color or icon type.
     [self resetButtonStateImages];
   }
 }
 
 @end