Remove "updatecheck" tag when fetching default settings.

The "updatecheck" tag is unnecessary when we want to fetch default
settings. Additionally its presence causes the servers to infer that
Chrome needs to be updated.

BUG=727829
TBR=vasilii@chromium.org

Review-Url: https://codereview.chromium.org/2908073006
Cr-Commit-Position: refs/heads/master@{#475849}

chrome/browser/profile_resetter/brandcode_config_fetcher.cc

@@ -30,7 +30,6 @@ const char kPostXml[] =
 "    appid=\"{8A69D345-D564-463C-AFF1-A69D9E530F96}\"\n"
 "    version=\"0.0.0.0\"\n"
 "      >\n"
-"    <updatecheck />\n"
 "    <data name=\"install\" "
     "index=\"__BRANDCODE_PLACEHOLDER__\" />\n"
 "  </app>\n"