UserAgent: Mozilla/5.0 (Windows NT 6.3; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.103 Safari/537.36

Steps to reproduce the problem:
1. Add icu_use_data_file_flag=0 in GYP_DEFINES
2. regenerate gyps.
3. build

What is the expected behavior?
Build should be successfull.

What went wrong?
Build will reports error like this:

../../base/i18n/icu_util.cc:64:5: error: 'base::i18n::{anonymous}::g_debug_icu_last_error' defined but not used [-Werror=unused-variable]
 int g_debug_icu_last_error;
     ^
../../base/i18n/icu_util.cc:65:5: error: 'base::i18n::{anonymous}::g_debug_icu_load' defined but not used [-Werror=unused-variable]
 int g_debug_icu_load;
     ^
../../base/i18n/icu_util.cc:66:5: error: 'base::i18n::{anonymous}::g_debug_icu_pf_error_details' defined but not used [-Werror=unused-variable]
 int g_debug_icu_pf_error_details;
     ^
../../base/i18n/icu_util.cc:67:5: error: 'base::i18n::{anonymous}::g_debug_icu_pf_last_error' defined but not used [-Werror=unused-variable]
 int g_debug_icu_pf_last_error;
     ^
cc1plus: all warnings being treated as errors
[16/59] CXX obj/content/app/content_app_both.content_main_runner.o
ninja: build stopped: subcommand failed.

Did this work before? N/A 

Chrome version: 51.0.2704.103  Channel: n/a
OS Version: 6.3
Flash Version: Shockwave Flash 22.0 r0