Round up button's dimensions so width and height are always pixel-aligned..

chrome/browser/ui/cocoa/website_settings/split_block_button.mm

Index: chrome/browser/ui/cocoa/website_settings/split_block_button.mm
diff --git a/chrome/browser/ui/cocoa/website_settings/split_block_button.mm b/chrome/browser/ui/cocoa/website_settings/split_block_button.mm
index e247a231f619ced17495646c2e8d1d215764a7f3..b57a59c008c5960f5b0ee3050bb4fe78de76ee64 100644
--- a/chrome/browser/ui/cocoa/website_settings/split_block_button.mm
+++ b/chrome/browser/ui/cocoa/website_settings/split_block_button.mm
@@ -262,9 +262,9 @@ void DrawBezel(id<ConstrainedWindowButtonDrawableCell>cell,
   NSSize leftSize = [leftCell_ cellSize];
   NSSize rightSize = [rightCell_ cellSize];
   NSSize size = NSMakeSize(
-      std::max(leftSize.width + rightSize.width,
-               constrained_window_button::kButtonMinWidth),
-      std::max(leftSize.height, rightSize.height));
+      std::ceil(std::max(leftSize.width + rightSize.width,
+                         constrained_window_button::kButtonMinWidth)),
+      std::ceil(std::max(leftSize.height, rightSize.height)));
   [self setFrameSize:size];
 }