[Chromoting] Factor out common code for pin hashing.

remoting/remoting.gyp

Index: remoting/remoting.gyp
diff --git a/remoting/remoting.gyp b/remoting/remoting.gyp
index 53927b17a4bc363a73baea0b5bec96dc17d93049..d41bf38225bf942f1643d42776b2e0f4f25e5a37 100644
--- a/remoting/remoting.gyp
+++ b/remoting/remoting.gyp
@@ -328,6 +328,8 @@
             'host/elevated_controller_module_win.cc',
             'host/elevated_controller_win.cc',
             'host/elevated_controller_win.h',
+            'host/pin_hash.cc',
+            'host/pin_hash.h',
             'host/verify_config_window_win.cc',
             'host/verify_config_window_win.h',
             '<(SHARED_INTERMEDIATE_DIR)/remoting/elevated_controller_version.rc'
@@ -622,6 +624,8 @@
         'host/plugin/daemon_controller.h',
         'host/daemon_controller_common_win.cc',
         'host/daemon_controller_common_win.h',
+        'host/pin_hash.cc',
+        'host/pin_hash.h',
         'host/plugin/daemon_controller_linux.cc',
         'host/plugin/daemon_controller_mac.cc',
         'host/plugin/daemon_controller_win.cc',
@@ -1609,6 +1613,8 @@
             'host/it2me_host_user_interface.h',
             'host/json_host_config_unittest.cc',
             'host/log_to_server_unittest.cc',
+            'host/pin_hash.cc',
+            'host/pin_hash_unittest.cc',
             'host/register_support_host_request_unittest.cc',
             'host/screen_recorder_unittest.cc',
             'host/server_log_entry_unittest.cc',