Fix a typo with astro.h

BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/host_byteorder.gni")
 import("//third_party/icu/config.gni")
 
 if (is_android) {
   import("//build/config/android/rules.gni")
 }
@@ skipping 432 matching lines @@
     "source/i18n/wintzimpl.h",
     "source/i18n/zonemeta.cpp",
     "source/i18n/zonemeta.h",
     "source/i18n/zrule.cpp",
     "source/i18n/zrule.h",
     "source/i18n/ztrans.cpp",
     "source/i18n/ztrans.h",
   ]
   # ls source/i18n/unicode/*h | sort | sed 's/^\(.*\)$/    "\1",/'
   public = [
-    // crbug.com/726654: Make astro.h public until the upstream adds an API.
+    # crbug.com/726654: Make astro.h public until the upstream adds an API.
     "source/i18n/astro.h",
     "source/i18n/unicode/alphaindex.h",
     "source/i18n/unicode/basictz.h",
     "source/i18n/unicode/calendar.h",
     "source/i18n/unicode/choicfmt.h",
     "source/i18n/unicode/coleitr.h",
     "source/i18n/unicode/coll.h",
     "source/i18n/unicode/compactdecimalformat.h",
     "source/i18n/unicode/curramt.h",
     "source/i18n/unicode/currpinf.h",
@@ skipping 574 matching lines @@
       }
     }
 
     source_set("icudata") {
       sources = [ "$data_assembly" ]
       defines = [ "U_HIDE_DATA_SYMBOL" ]
       deps = [ ":make_data_assembly", ]
     }
   }
 }