Remove "-mfloat-abi=hard" from host compiler cflags, which causes building chrome browser failure.

build/common.gypi

 # Copyright 2012 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 121 matching lines @@
               [ 'v8_can_use_vfp_instructions=="true"', {
                 'defines': [
                   'CAN_USE_VFP_INSTRUCTIONS',
                 ],
               }],
               [ 'v8_use_arm_eabi_hardfloat=="true"', {
                 'defines': [
                   'USE_EABI_HARDFLOAT=1',
                   'CAN_USE_VFP_INSTRUCTIONS',
                 ],
-                'cflags': [
-                  '-mfloat-abi=hard',
+                'target_conditions': [
+                  ['_toolset=="target"', { 
+                    'cflags': ['-mfloat-abi=hard',], 
+                  }],
                 ],
               }, {
                 'defines': [
                   'USE_EABI_HARDFLOAT=0',
                 ],
               }],
               # The ARM assembler assumes the host is 32 bits,
               # so force building 32-bit host tools.
               ['host_arch=="x64" or OS=="android"', {
                 'target_conditions': [
@@ skipping 229 matching lines @@
                 # some test cases can cause stack overflow.
                 # 'StackReserveSize': '297152',
               },
             },
           }],  # OS=="win"
         ],  # conditions
       },  # Release
     },  # configurations
   },  # target_defaults
 }