Remove support for Mac OS X Leopard (10.5)

Source/core/platform/graphics/cocoa/FontPlatformDataCocoa.mm

Index: Source/core/platform/graphics/cocoa/FontPlatformDataCocoa.mm
diff --git a/Source/core/platform/graphics/cocoa/FontPlatformDataCocoa.mm b/Source/core/platform/graphics/cocoa/FontPlatformDataCocoa.mm
index f82ed91af2291b7645cb009c1ebbe6a1f46678f2..ac239fa24ac43995573ee29dd379c9833b5f1263 100644
--- a/Source/core/platform/graphics/cocoa/FontPlatformDataCocoa.mm
+++ b/Source/core/platform/graphics/cocoa/FontPlatformDataCocoa.mm
@@ -78,7 +78,7 @@ FontPlatformData:: ~FontPlatformData()
 
 void FontPlatformData::platformDataInit(const FontPlatformData& f)
 {
-    m_font = f.m_font && f.m_font != reinterpret_cast<NSFont *>(-1) ? const_cast<NSFont *>(static_cast<const NSFont *>(CFRetain(f.m_font))) : f.m_font;
+    m_font = f.m_font && f.m_font != reinterpret_cast<NSFont *>(-1) ? [f.m_font retain] : f.m_font;
 
     m_cgFont = f.m_cgFont;
     m_CTFont = f.m_CTFont;
@@ -233,23 +233,13 @@ static CTFontDescriptorRef cascadeToLastResortAndDisableSwashesFontDescriptor()
     return descriptor;
 }
 
-// Adding a cascade list breaks the font on Leopard
-static bool canSetCascadeListForCustomFont()
-{
-#if __MAC_OS_X_VERSION_MIN_REQUIRED >= 1060
-    return true;
-#else
-    return false;
-#endif
-}
-
 CTFontRef FontPlatformData::ctFont() const
 {
     if (m_CTFont)
         return m_CTFont.get();
 
     if (m_inMemoryFont) {
-        m_CTFont.adoptCF(CTFontCreateWithGraphicsFont(m_inMemoryFont->cgFont(), m_size, 0, canSetCascadeListForCustomFont() ? cascadeToLastResortFontDescriptor() : 0));
+        m_CTFont.adoptCF(CTFontCreateWithGraphicsFont(m_inMemoryFont->cgFont(), m_size, 0, cascadeToLastResortFontDescriptor()));
         return m_CTFont.get();
     }
 
@@ -264,7 +254,7 @@ CTFontRef FontPlatformData::ctFont() const
             fontDescriptor = cascadeToLastResortFontDescriptor();
         m_CTFont.adoptCF(CTFontCreateCopyWithAttributes(m_CTFont.get(), m_size, 0, fontDescriptor));
     } else
-        m_CTFont.adoptCF(CTFontCreateWithGraphicsFont(m_cgFont.get(), m_size, 0, canSetCascadeListForCustomFont() ? cascadeToLastResortFontDescriptor() : 0));
+        m_CTFont.adoptCF(CTFontCreateWithGraphicsFont(m_cgFont.get(), m_size, 0, cascadeToLastResortFontDescriptor()));
 
     if (m_widthVariant != RegularWidth) {
         int featureTypeValue = kTextSpacingType;