Make panel arrows slightly smaller

ash/wm/panels/panel_layout_manager.cc

 // Copyright (c) 2012 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/wm/panels/panel_layout_manager.h"
 
 #include <algorithm>
 #include <map>
 
 #include "ash/launcher/launcher.h"
@@ skipping 26 matching lines @@
 
 namespace {
 const int kPanelMarginEdge = 4;
 const int kPanelMarginMiddle = 8;
 const int kPanelIdealSpacing = 4;
 
 const float kMaxHeightFactor = .80f;
 const float kMaxWidthFactor = .50f;
 
 // Callout arrow dimensions.
-const int kArrowWidth = 20;
-const int kArrowHeight = 10;
+const int kArrowWidth = 18;
+const int kArrowHeight = 9;
 
 class CalloutWidgetBackground : public views::Background {
  public:
   CalloutWidgetBackground() : alignment_(SHELF_ALIGNMENT_BOTTOM) {
   }
 
   virtual void Paint(gfx::Canvas* canvas, views::View* view) const OVERRIDE {
     SkPath path;
     switch (alignment_) {
       case SHELF_ALIGNMENT_BOTTOM:
@@ skipping 558 matching lines @@
 
     SetChildBoundsDirect(callout_widget->GetNativeWindow(), callout_bounds);
     panel_container_->StackChildAbove(callout_widget->GetNativeWindow(),
                                       panel);
     callout_widget->Show();
   }
 }
 
 }  // namespace internal
 }  // namespace ash