Use Helvetica rather than Arial for badging on the Mac....

chrome/common/extensions/extension_action.cc

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "app/gfx/canvas.h"
 #include "app/resource_bundle.h"
 #include "base/gfx/rect.h"
 #include "chrome/app/chrome_dll_resource.h"
 #include "chrome/common/extensions/extension_action.h"
 #include "grit/app_resources.h"
@@ skipping 36 matching lines @@
   const int kBottomMargin = 5;
   const int kPadding = 2;
   const int kBadgeHeight = 11;
   const int kMaxTextWidth = 23;
   // The minimum width for center-aligning the badge.
   const int kCenterAlignThreshold = 20;
 #endif
 
   canvas->save();
 
+#if defined(OS_MACOSX)
+  SkTypeface* typeface =
+      SkTypeface::CreateFromName("Helvetica", SkTypeface::kBold);
+#else
   SkTypeface* typeface = SkTypeface::CreateFromName("Arial", SkTypeface::kBold);
+#endif
   SkPaint text_paint;
   text_paint.setAntiAlias(true);
   text_paint.setColor(text_color);
   text_paint.setFakeBoldText(true);
   text_paint.setTextAlign(SkPaint::kLeft_Align);
   text_paint.setTextSize(SkIntToScalar(kTextSize));
   text_paint.setTypeface(typeface);
 
   // Calculate text width. We clamp it to a max size.
   SkScalar text_width = text_paint.measureText(text.c_str(), text.size());
@@ skipping 47 matching lines @@
   // text was too large.
   rect.fLeft += kPadding;
   rect.fRight -= kPadding;
   canvas->clipRect(rect);
   canvas->drawText(text.c_str(), text.size(),
                    rect.fLeft + (rect.width() - text_width) / 2,
                    rect.fTop + kTextSize + 1,
                    text_paint);
   canvas->restore();
 }