Have all skia platforms share FontPlatformData::hash() implementation

Source/core/platform/graphics/harfbuzz/FontPlatformDataHarfBuzz.cpp

 /*
  * Copyright (c) 2006, 2007, 2008, Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 222 matching lines @@
 
     return typefacesEqual
         && m_textSize == a.m_textSize
         && m_fakeBold == a.m_fakeBold
         && m_fakeItalic == a.m_fakeItalic
         && m_orientation == a.m_orientation
         && m_style == a.m_style
         && m_isHashTableDeletedValue == a.m_isHashTableDeletedValue;
 }
 
-unsigned FontPlatformData::hash() const
-{
-    unsigned h = SkTypeface::UniqueID(m_typeface.get());
-    h ^= 0x01010101 * ((static_cast<int>(m_orientation) << 2) | (static_cast<int>(m_fakeBold) << 1) | static_cast<int>(m_fakeItalic));
-
-    // This memcpy is to avoid a reinterpret_cast that breaks strict-aliasing
-    // rules. Memcpy is generally optimized enough so that performance doesn't
-    // matter here.
-    uint32_t textSizeBytes;
-    memcpy(&textSizeBytes, &m_textSize, sizeof(uint32_t));
-    h ^= textSizeBytes;
-
-    return h;
-}
-
 bool FontPlatformData::isFixedPitch() const
 {
     notImplemented();
     return false;
 }
 
 HarfBuzzFace* FontPlatformData::harfBuzzFace() const
 {
     if (!m_harfBuzzFace)
         m_harfBuzzFace = HarfBuzzFace::create(const_cast<FontPlatformData*>(this), uniqueID());
@@ skipping 38 matching lines @@
         m_style.useAutoHint = useSkiaAutoHint;
     if (m_style.useSubpixelPositioning == FontRenderStyle::NoPreference)
         m_style.useSubpixelPositioning = useSkiaSubpixelPositioning;
     if (m_style.useAntiAlias == FontRenderStyle::NoPreference)
         m_style.useAntiAlias = useSkiaAntiAlias;
     if (m_style.useSubpixelRendering == FontRenderStyle::NoPreference)
         m_style.useSubpixelRendering = useSkiaSubpixelRendering;
 }
 
 } // namespace WebCore