[Views] Don't reset button state after dragging if the button is disabled.

ui/views/controls/button/custom_button.cc

Index: ui/views/controls/button/custom_button.cc
diff --git a/ui/views/controls/button/custom_button.cc b/ui/views/controls/button/custom_button.cc
index 11fbbcde1c5ccda74420d9c0a93dbdcfdf357695..d9db86712a2f3cb67838a6a55559459ef6a73ac0 100644
--- a/ui/views/controls/button/custom_button.cc
+++ b/ui/views/controls/button/custom_button.cc
@@ -273,7 +273,10 @@ void CustomButton::ShowContextMenu(const gfx::Point& p,
 }
 
 void CustomButton::OnDragDone() {
-  SetState(STATE_NORMAL);
+  // Only reset the state to normal if the button isn't currently disabled
+  // (since disabled buttons may still be able to be dragged).
+  if (state_ != STATE_DISABLED)
+    SetState(STATE_NORMAL);
 }
 
 void CustomButton::GetAccessibleState(ui::AXViewState* state) {