Always use the FreeType headers included in PDFium.

pdfium.gyp

Index: pdfium.gyp
diff --git a/pdfium.gyp b/pdfium.gyp
index 8b13321ab906c3cf502ab57ee0e94885e0e70961..2b21e9d9aaa2ff3b5cf917c84af4747c300ab3a5 100644
--- a/pdfium.gyp
+++ b/pdfium.gyp
@@ -16,21 +16,17 @@
       '_NO_GDIPLUS_',  # workaround text rendering issues on Windows
       'OPJ_STATIC',
     ],
+    'include_dirs': [
+      'third_party/freetype/include',
+    ],
     'conditions': [
       ['pdf_use_skia==1', {
         'defines': ['_SKIA_SUPPORT_'],
       }],
       ['bundle_freetype==1', {
-        'include_dirs': [
-          'third_party/freetype/include',
-        ],
         'defines' : [
           'FT2_BUILD_LIBRARY',
         ],
-      }, {
-        'include_dirs' : [
-          '/usr/include/freetype2',
-        ],
       }],
       ['OS=="linux"', {
         'conditions': [