Linux: control usage of Kerberos via use_kerberos gyp flag

net/net.gyp

Index: net/net.gyp
diff --git a/net/net.gyp b/net/net.gyp
index 4b2259eb9605039822b4dc35e409073a7e86350a..801001691e3fd4067a00f89aae079ea04ef677b5 100644
--- a/net/net.gyp
+++ b/net/net.gyp
@@ -5,6 +5,8 @@
 {
   'variables': {
     'chromium_code': 1,
+
+    'use_kerberos%': 1,
   },
   'targets': [
     {
@@ -700,6 +702,18 @@
              'proxy/proxy_config_service_linux.h',
           ],
         }],
+        ['use_kerberos==1', {
+          'defines': [
+            'USE_KERBEROS',
+          ],
+        }, { # use_kerberos == 0
+          'sources!': [
+            'http/http_auth_gssapi_posix.cc',
+            'http/http_auth_gssapi_posix.h',
+            'http/http_auth_handler_negotiate.h',
+            'http/http_auth_handler_negotiate.cc',
+          ],
+        }],
         ['use_openssl==1', {
             'sources!': [
               'base/cert_database_nss.cc',
@@ -1070,6 +1084,18 @@
             }],
           ],
         }],
+        [ 'use_kerberos==1', {
+          'defines': [
+            'USE_KERBEROS',
+          ],
+        }, { # use_kerberos == 0
+          'sources!': [
+            'http/http_auth_gssapi_posix_unittest.cc',
+            'http/http_auth_handler_negotiate_unittest.cc',
+            'http/mock_gssapi_library_posix.cc',
+            'http/mock_gssapi_library_posix.h',
+          ],
+        }],
         [ 'use_openssl==1', {
             # When building for OpenSSL, we need to exclude NSS specific tests.
             # TODO(bulach): Add equivalent tests when the underlying