Remove WTF_USE_HARFBUZZ

Remove the WTF_USE_HARFBUZZ define and the remaining use of it as it is
it only used in files compiled on platforms where it is guaranteed to be
true.

Review URL: https://codereview.chromium.org/416273004

git-svn-id: svn://svn.chromium.org/blink/trunk@179185 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/config.h

@@ -138,7 +138,3 @@
 #include <cstddef>
 
 #endif
-
-#if OS(LINUX) || OS(ANDROID) || OS(WIN)
-#define WTF_USE_HARFBUZZ 1
-#endif

third_party/WebKit/Source/platform/fonts/skia/SimpleFontDataSkia.cpp

@@ -259,7 +259,6 @@ float SimpleFontData::platformWidthForGlyph(Glyph glyph) const
     return SkScalarToFloat(width);
 }
 
-#if USE(HARFBUZZ)
 bool SimpleFontData::canRenderCombiningCharacterSequence(const UChar* characters, size_t length) const
 {
     if (!m_combiningCharacterSequenceSupport)
@@ -285,7 +284,6 @@ bool SimpleFontData::canRenderCombiningCharacterSequence(const UChar* characters
     }
     return false;
 }
-#endif
 
 bool SimpleFontData::fillGlyphPage(GlyphPage* pageToFill, unsigned offset, unsigned length, UChar* buffer, unsigned bufferLength) const
 {