Use vector image resources in extension install dialog.

chrome/browser/ui/views/extensions/extension_install_dialog_view.h

 // Copyright 2014 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.
 
 #ifndef CHROME_BROWSER_UI_VIEWS_EXTENSIONS_EXTENSION_INSTALL_DIALOG_VIEW_H_
 #define CHROME_BROWSER_UI_VIEWS_EXTENSIONS_EXTENSION_INSTALL_DIALOG_VIEW_H_
 
 #include "chrome/browser/extensions/extension_install_prompt.h"
 #include "ui/gfx/animation/animation_delegate.h"
 #include "ui/gfx/animation/slide_animation.h"
@@ skipping 167 matching lines @@
    private:
     views::GridLayout* layout_;
     double state_;
 
     DISALLOW_COPY_AND_ASSIGN(DetailsView);
   };
 
   // Expand/Collapse the detail section for this ExpandableContainerView.
   void ToggleDetailLevel();
 
+  // Updates |arrow_toggle_| according to the given state.
+  void UpdateArrowToggle(bool expanded);
+
   // The dialog that owns |this|. It's also an ancestor in the View hierarchy.
   ExtensionInstallDialogView* owner_;
 
   // A view for showing |issue_advice.details|.
   DetailsView* details_view_;
 
   gfx::SlideAnimation slide_animation_;
 
   // The 'more details' link shown under the heading (changes to 'hide details'
   // when the details section is expanded).
   views::Link* more_details_;
 
   // The up/down arrow next to the 'more detail' link (points up/down depending
   // on whether the details section is expanded).
   views::ImageButton* arrow_toggle_;
 
   // Whether the details section is expanded.
   bool expanded_;
 
   DISALLOW_COPY_AND_ASSIGN(ExpandableContainerView);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_EXTENSIONS_EXTENSION_INSTALL_DIALOG_VIEW_H_