Fix handling of visual studio override when using automated toolchain.

BUG=

Review URL: https://codereview.chromium.org/130183002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@243845 0039d316-1c4b-4281-b951-d872f2087c98

build/gyp_chromium

@@ -189,7 +189,7 @@ def GetArgsStringForGN(supplemental_files):
     gn_args += ' visual_studio_version=' + EscapeStringForGN(gyp_msvs_version)
   gyp_msvs_override_path = os.environ.get('GYP_MSVS_OVERRIDE_PATH', '')
   if gyp_msvs_override_path:
-    gn_args += ' visual_studio_override_path=' + \
+    gn_args += ' visual_studio_path=' + \
         EscapeStringForGN(gyp_msvs_override_path)
 
   # Set the GYP flag so BUILD files know they're being invoked in GYP mode.