Add collection-iterator.js to BUILD.gn after r21615

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.
 
 # TODO(jochen): These will need to be user-settable to support standalone V8
 # builds.
 v8_compress_startup_data = "off"
 v8_deprecation_warnings = false
 v8_enable_disassembler = false
 v8_enable_gdbjit = false
@@ skipping 202 matching lines @@
 
   # The script depends on this other script, this rule causes a rebuild if it
   # changes.
   source_prereqs = [ "tools/jsmin.py" ]
 
   sources = [
     "src/macros.py",
     "src/symbol.js",
     "src/proxy.js",
     "src/collection.js",
+    "src/collection-iterator.js",
     "src/generator.js",
     "src/array-iterator.js",
     "src/harmony-string.js",
     "src/harmony-array.js",
     "src/harmony-math.js",
   ]
 
   outputs = [
     "$target_gen_dir/experimental-libraries.cc"
   ]
@@ skipping 28 matching lines @@
 
   deps = [ ":mksnapshot($host_toolchain)" ]
 
   script = "tools/run.py"
 
   outputs = [
     "$target_gen_dir/snapshot.cc"
   ]
 
   args = [
-    "./" + rebase_path(get_label_info(":mksnapshot($host_toolchain)", 
+    "./" + rebase_path(get_label_info(":mksnapshot($host_toolchain)",
                                       "root_out_dir") + "/mksnapshot",
                        root_build_dir),
     "--log-snapshot-positions",
     "--logfile", rebase_path("$target_gen_dir/snapshot.log", root_build_dir)
   ]
 
   if (v8_random_seed != "0") {
     args += [ "--random-seed", v8_random_seed ]
   }
 
@@ skipping 743 matching lines @@
   } else {
     deps = [
       ":v8_base",
       ":v8_nosnapshot",
     ]
   }
   # TODO(jochen): Support direct dependent configs.
 }
 
 }