Use the system provided harfbuzz on chromeos

build/common.gypi

Index: build/common.gypi
diff --git a/build/common.gypi b/build/common.gypi
index dbfd8243fe7f52f8174d6529da5ac955e2ed5d16..280ec278f77703931b979327db8fa17ac08fd627 100644
--- a/build/common.gypi
+++ b/build/common.gypi
@@ -151,6 +151,10 @@
         'use_goma%': 0,
         'gomadir%': '',
 
+        # The system root for cross-compiles. Default: none.
+        'sysroot%': '',
+        'chroot_cmd%': '',
+
         'conditions': [
           # Ash needs Aura.
           ['use_aura==0', {
@@ -258,6 +262,8 @@
       'buildtype%': '<(buildtype)',
       'branding%': '<(branding)',
       'arm_version%': '<(arm_version)',
+      'sysroot%': '<(sysroot)',
+      'chroot_cmd%': '<(chroot_cmd)',
 
       # Set to 1 to enable fast builds. Set to 2 for even faster builds
       # (it disables debug info for fastest compilation - only for use
@@ -283,10 +289,6 @@
       # Detect NEON support at run-time.
       'arm_neon_optional%': 0,
 
-      # The system root for cross-compiles. Default: none.
-      'sysroot%': '',
-      'chroot_cmd%': '',
-
       # The system libdir used for this ABI.
       'system_libdir%': 'lib',
 
@@ -2979,8 +2981,7 @@
     },
   },
   'conditions': [
-    # TODO(jochen): Enable this on chromeos. http://crbug.com/353127 
-    ['os_posix==1 and chromeos==0', {
+    ['os_posix==1', {
       'target_defaults': {
         'ldflags': [
           '-Wl,--fatal-warnings',