remoting: use VerifyHostPinHash() in place on IsPinValid()

remoting/remoting_host_mac.gypi

Index: remoting/remoting_host_mac.gypi
diff --git a/remoting/remoting_host_mac.gypi b/remoting/remoting_host_mac.gypi
index dce3cf08b6d79024b3c02f0ff5b44dd785a9eb60..4b222b2f5474257eb383bc4a3db010120a963471 100644
--- a/remoting/remoting_host_mac.gypi
+++ b/remoting/remoting_host_mac.gypi
@@ -190,18 +190,10 @@
         '../third_party/jsoncpp/source/include/',
         '../third_party/jsoncpp/source/src/lib_json/',
       ],
-
-      # These source files are included directly, instead of adding target
-      # dependencies, because the targets are not yet built for 64-bit on
-      # Mac OS X - http://crbug.com/125116.
-      #
-      # TODO(lambroslambrou): Fix this when Chrome supports building for
-      # Mac OS X 64-bit - http://crbug.com/128122.
       'sources': [

[tfarina, 2015/12/24 20:50:43]

I don't understand what is going on with remoting_host_prefpane. Looks like it
wants to build i386 (32-bit) even when the host is x86_64 (64-bit).

Adding 'remoting_host' to dependencies list does not have any effect for:

$ ninja -C out/Release remoting_host_prefpane
...
Undefined symbols for architecture i386:
  "remoting::VerifyHostPinHash(std::__1::basic_string<char,
std::__1::char_traits<char>, std::__1::allocator<char> > const&,
std::__1::basic_string<char, std::__1::char_traits<char>,
std::__1::allocator<char> > const&, std::__1::basic_string<char,
std::__1::char_traits<char>, std::__1::allocator<char> > const&)", referenced
from:
      -[Me2MePreferencePane applyConfiguration:pin:] in
remoting_host_prefpane.me2me_preference_pane.i386.o

         '../third_party/jsoncpp/overrides/src/lib_json/json_value.cpp',
         '../third_party/jsoncpp/overrides/src/lib_json/json_reader.cpp',
         '../third_party/jsoncpp/source/src/lib_json/json_writer.cpp',
-        '../third_party/modp_b64/modp_b64.cc',
         'host/constants_mac.cc',
         'host/constants_mac.h',
         'host/host_config_constants.cc',