Set -mfloat-abi=hard in pnacl newlib nonsfi toolchain.

build/config/compiler/BUILD.gn

 # Copyright (c) 2013 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/android/config.gni")
 import("//build/config/chrome_build.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/nacl/config.gni")
 import("//build/toolchain/cc_wrapper.gni")
 import("//build/toolchain/toolchain.gni")
@@ skipping 656 matching lines @@
         ]
         ldflags += [
           "-arch",
           "x86-32-nonsfi",
           "--target=i686-unknown-nacl",
         ]
       } else if (target_cpu == "arm") {
         cflags += [
           "-arch",
           "arm-nonsfi",
+          "-mfloat-abi=hard",
           "--pnacl-bias=arm-nonsfi",
           "--target=armv7-unknown-nacl-gnueabihf",
         ]
         ldflags += [
           "-arch",
           "arm-nonsfi",
           "--target=armv7-unknown-nacl-gnueabihf",
         ]
       }
     }
@@ skipping 862 matching lines @@
 
 if (is_ios || is_mac) {
   # On Mac and iOS, this enables support for ARC (automatic ref-counting).
   # See http://clang.llvm.org/docs/AutomaticReferenceCounting.html.
   config("enable_arc") {
     common_flags = [ "-fobjc-arc" ]
     cflags_objc = common_flags
     cflags_objcc = common_flags
   }
 }