NaCl/GYP: remove references to prep_toolchain.

icu_nacl.gyp

Index: icu_nacl.gyp
diff --git a/icu_nacl.gyp b/icu_nacl.gyp
index 7cead47ba4721766ae1bfa085fc481c7c3472a34..d20fa53139bb8292cc3050e97fd61367666f8393 100644
--- a/icu_nacl.gyp
+++ b/icu_nacl.gyp
@@ -54,9 +54,6 @@
         # TODO(jungshik): Remove it once a fix for bug 384752 is in.
         'source/common/unicode/uvernum.h',
       ],
-      'dependencies': [
-        '../../native_client/tools.gyp:prep_toolchain',
-      ],
     },
     {
       'target_name': 'icui18n_nacl',
@@ -74,7 +71,6 @@
         'U_I18N_IMPLEMENTATION',
       ],
       'dependencies': [
-        '../../native_client/tools.gyp:prep_toolchain',
         'icuuc_nacl',
       ],
       'direct_dependent_settings': {
@@ -99,7 +95,6 @@
         'U_COMMON_IMPLEMENTATION',
       ],
       'dependencies': [
-        '../../native_client/tools.gyp:prep_toolchain',
         'icudata_nacl',
       ],
       'direct_dependent_settings': {