Skia doesn't depend on harfbuzz, so remove the dependency.

skia/skia.gyp

Index: skia/skia.gyp
diff --git a/skia/skia.gyp b/skia/skia.gyp
index 62404d18407c748d6755e5376ebef893b85a367d..01cbe3fe0759fccb52b3f9370c39fb2ae178c556 100644
--- a/skia/skia.gyp
+++ b/skia/skia.gyp
@@ -354,7 +354,6 @@
             '../build/linux/system.gyp:fontconfig',
             '../build/linux/system.gyp:freetype2',
             '../build/linux/system.gyp:pangocairo',
-            '../third_party/harfbuzz-ng/harfbuzz.gyp:harfbuzz-ng',
             '../third_party/icu/icu.gyp:icuuc',
           ],
           'cflags': [
@@ -401,7 +400,6 @@
               'dependencies': [
                 '../third_party/expat/expat.gyp:expat',
                 '../third_party/freetype/freetype.gyp:ft2',
-                '../third_party/harfbuzz/harfbuzz.gyp:harfbuzz',
                 'skia_opts'
               ],
               'dependencies!': [
@@ -422,9 +420,6 @@
               'sources!': [
                 'ext/vector_platform_device_skia.cc',
               ],
-              'export_dependent_settings': [
-                '../third_party/harfbuzz/harfbuzz.gyp:harfbuzz',
-              ],
             }],
             [ '_toolset == "target" and android_build_type == 0', {
               'defines': [