Convert SizeStringInt from taking a wstring to a string16.

gfx/canvas_skia_mac.mm

Index: gfx/canvas_skia_mac.mm
diff --git a/gfx/canvas_skia_mac.mm b/gfx/canvas_skia_mac.mm
index 547a5e4848637875d2e4056f26c6f608b097e2ab..1c3dccaa5b7b54f79340034b5b57551749c8a8b8 100644
--- a/gfx/canvas_skia_mac.mm
+++ b/gfx/canvas_skia_mac.mm
@@ -25,12 +25,12 @@ CanvasSkia::~CanvasSkia() {
 }
 
 // static
-void CanvasSkia::SizeStringInt(const std::wstring& text,
+void CanvasSkia::SizeStringInt(const string16& text,
                                const gfx::Font& font,
                                int* width, int* height,
                                int flags) {
   NSFont* native_font = font.GetNativeFont();
-  NSString* ns_string = base::SysWideToNSString(text);
+  NSString* ns_string = base::SysUTF16ToNSString(text);
   NSDictionary* attributes =
       [NSDictionary dictionaryWithObject:native_font
                                   forKey:NSFontAttributeName];