Render the tab close button as a vector-based icon.

chrome/browser/ui/views/layout_constants.cc

Index: chrome/browser/ui/views/layout_constants.cc
diff --git a/chrome/browser/ui/views/layout_constants.cc b/chrome/browser/ui/views/layout_constants.cc
index 4acf9a5c81332d9ec233ee7c13f614e33962fa01..9af0572c37c7671ea213dae3ca93ffeb3e4b5cf6 100644
--- a/chrome/browser/ui/views/layout_constants.cc
+++ b/chrome/browser/ui/views/layout_constants.cc
@@ -16,7 +16,7 @@ int GetLayoutConstant(LayoutConstant constant) {
   const int kLocationBarVerticalPadding[] = {2, 2, 2};
   const int kOmniboxDropdownBorderInterior[] = {6, 0, 0};
   const int kOmniboxFontPixelSize[] = {16, 14, 14};
-  const int kTabCloseButtonTrailingPaddingOverlap[] = {3, 3, 3};
+  const int kTabCloseButtonTrailingPaddingOverlap[] = {2, 2, 2};
   const int kTabFaviconTitleSpacing[] = {4, 4, 4};
   const int kTabMaximumTitleWidth[] = {175, 175, 175};
   const int kTabPinnedContentWidth[] = {25, 25, 25};