Rename FontPlatformDataCocoa and remove fonts/cocoa directory

Source/platform/blink_platform.gypi

 {
   'includes': [
     'platform_generated.gypi',
   ],
   'variables': {
     'platform_files': [
       'AsyncFileSystemCallbacks.h',
       'CalculationValue.h',
       'CheckedInt.h',
       'Clock.cpp',
@@ skipping 369 matching lines @@
       'fonts/SegmentedFontData.h',
       'fonts/SimpleFontData.cpp',
       'fonts/SimpleFontData.h',
       'fonts/SimpleShaper.cpp',
       'fonts/SimpleShaper.h',
       'fonts/TextBlob.h',
       'fonts/VDMXParser.cpp',
       'fonts/VDMXParser.h',
       'fonts/WidthCache.h',
       'fonts/android/FontCacheAndroid.cpp',
-      'fonts/cocoa/FontPlatformDataCocoa.mm',
       'fonts/harfbuzz/HarfBuzzFace.cpp',
       'fonts/harfbuzz/HarfBuzzFace.h',
       'fonts/harfbuzz/HarfBuzzShaper.cpp',
       'fonts/harfbuzz/HarfBuzzShaper.h',
       'fonts/linux/FontCacheLinux.cpp',
       'fonts/linux/FontPlatformDataLinux.cpp',
       'fonts/mac/FontCacheMac.mm',
       'fonts/mac/FontCustomPlatformDataMac.cpp',
+      'fonts/mac/FontPlatformDataMac.mm',
       'fonts/mac/MemoryActivatedFont.h',
       'fonts/mac/MemoryActivatedFont.mm',
       'fonts/opentype/OpenTypeSanitizer.cpp',
       'fonts/opentype/OpenTypeSanitizer.h',
       'fonts/opentype/OpenTypeTypes.h',
       'fonts/opentype/OpenTypeUtilities.cpp',
       'fonts/opentype/OpenTypeUtilities.h',
       'fonts/opentype/OpenTypeVerticalData.cpp',
       'fonts/opentype/OpenTypeVerticalData.h',
       'fonts/skia/FontCacheSkia.cpp',
@@ skipping 552 matching lines @@
       'graphics/ImageFrameGeneratorTest.cpp',
       'graphics/ImageLayerChromiumTest.cpp',
       'graphics/test/MockImageDecoder.h',
       'graphics/test/MockWebGraphicsContext3D.h',
       'image-decoders/gif/GIFImageDecoderTest.cpp',
       'image-decoders/jpeg/JPEGImageDecoderTest.cpp',
       'image-decoders/webp/WEBPImageDecoderTest.cpp',
     ],
   },
 }