Only define SK_CRASH_HANDLER in crash_handler.

gyp/tools.gyp

     # GYP file to build various tools.
 #
 # To build on Linux:
 #  ./gyp_skia tools.gyp && make tools
 #
 {
   'includes': [
     'apptype_console.gypi',
   ],
   'targets': [
@@ skipping 32 matching lines @@
       ],
     },
     {
       'target_name': 'crash_handler',
         'type': 'static_library',
         'sources': [ '../tools/CrashHandler.cpp' ],
         'dependencies': [ 'skia_lib.gyp:skia_lib' ],
         'direct_dependent_settings': {
           'include_dirs': [ '../tools' ],
         },
+        'conditions': [
+          [ 'skia_is_bot', {
+            'defines': [ 'SK_CRASH_HANDLER' ],
+          }],
+        ],
+
         'all_dependent_settings': {
           'msvs_settings': {
             'VCLinkerTool': {
               'AdditionalDependencies': [ 'Dbghelp.lib' ],
             }
           },
         }
     },
     {
       'target_name': 'resources',
@@ skipping 698 matching lines @@
               'flags.gyp:flags',
               'skia_lib.gyp:skia_lib',
               'resources',
             ],
           },
         ],
       },
     ],
   ],
 }