Fix windows classic scrollbar buttons.

ui/gfx/native_theme_win.cc

Index: ui/gfx/native_theme_win.cc
diff --git a/ui/gfx/native_theme_win.cc b/ui/gfx/native_theme_win.cc
index 23a5e5012491c4a1b3882eaccdef34c3c72b641b..a99df3814a0ca62ffbba39a9ebf858903086d556 100644
--- a/ui/gfx/native_theme_win.cc
+++ b/ui/gfx/native_theme_win.cc
@@ -367,7 +367,22 @@ HRESULT NativeThemeWin::PaintScrollbarArrow(
       NOTREACHED() << "Invalid part: " << part;
       break;
   }
-
+  switch(state) {
+    case kDisabled:
+      classic_state |= DFCS_INACTIVE;
+      break;
+    case kHovered:
+      classic_state |= DFCS_HOT;
+      break;
+    case kNormal:
+      break;
+    case kPressed:
+      classic_state |= DFCS_PUSHED;
+      break;
+    default:
+      NOTREACHED() << "Invalid state: " << state;
+      break;
+  }
   DrawFrameControl(hdc, &rect_win, DFC_SCROLL, classic_state);
   return S_OK;
 }