Fix OS_MACOS typos. Should be OS_MACOSX.

BUG=163208
TEST=none

Review URL: https://codereview.chromium.org/12829005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@189130 0039d316-1c4b-4281-b951-d872f2087c98
  void PopulateForm(const std::string& field_id) {
    std::string js("document.getElementById('" + field_id + "').focus();");
    ASSERT_TRUE(content::ExecuteScript(render_view_host(), js));

    SendKeyToPageAndWait(ui::VKEY_DOWN);
    SendKeyToPopupAndWait(ui::VKEY_DOWN);
    SendKeyToPopupAndWait(ui::VKEY_RETURN);
  }

  void PopulateForm(const std::string& field_id) {
    std::string js("document.getElementById('" + field_id + "').focus();");
    ASSERT_TRUE(content::ExecuteScript(render_view_host(), js));

    SendKeyToPageAndWait(ui::VKEY_DOWN);
    SendKeyToPopupAndWait(ui::VKEY_DOWN);
    SendKeyToPopupAndWait(ui::VKEY_RETURN);
  }
