Fix incorrect use of AXState caused when refactoring two enums into one.

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 4890b1373a6a09b8abe538b6f102882870721ac0..e379b54179175ba19e1e0146a4de2f3ed5beb9fb 100644
--- a/ui/views/controls/button/custom_button.cc
+++ b/ui/views/controls/button/custom_button.cc
@@ -288,13 +288,13 @@ void CustomButton::GetAccessibleState(ui::AXViewState* state) {
   Button::GetAccessibleState(state);
   switch (state_) {
     case STATE_HOVERED:
-      state->state = ui::AX_STATE_HOVERED;
+      state->SetStateFlag(ui::AX_STATE_HOVERED);
       break;
     case STATE_PRESSED:
-      state->state = ui::AX_STATE_PRESSED;
+      state->SetStateFlag(ui::AX_STATE_PRESSED);
       break;
     case STATE_DISABLED:
-      state->state = ui::AX_STATE_DISABLED;
+      state->SetStateFlag(ui::AX_STATE_DISABLED);
       break;
     case STATE_NORMAL:
     case STATE_COUNT: