Remove Mac 10.7 runtime check

Bug: none
Change-Id: Ib8ee13da5ae9eea86f0ca22727acb07f883dd165
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2261263
Auto-Submit: Avi Drissman <avi@chromium.org>
Commit-Queue: Leonard Grey <lgrey@chromium.org>
Reviewed-by: Leonard Grey <lgrey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#781550}

content/common/cursors/webcursor_mac.mm

@@ -232,11 +232,7 @@ gfx::NativeCursor WebCursor::GetNativeCursor() {
       return GetCoreCursorWithFallback(kMoveCursor,
                                        IDR_MOVE_CURSOR, 7, 7);
     case ui::mojom::CursorType::kVerticalText:
-      // IBeamCursorForVerticalLayout is >= 10.7.
-      if ([NSCursor respondsToSelector:@selector(IBeamCursorForVerticalLayout)])
-        return [NSCursor IBeamCursorForVerticalLayout];
-      else
-        return LoadCursor(IDR_VERTICALTEXT_CURSOR, 7, 7);
+      return [NSCursor IBeamCursorForVerticalLayout];
     case ui::mojom::CursorType::kCell:
       return GetCoreCursorWithFallback(kCellCursor,
                                        IDR_CELL_CURSOR, 7, 7);