C++ readability change for cindylau.

BUG=none
TEST=none
Review URL: http://codereview.chromium.org/2090008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@48733 0039d316-1c4b-4281-b951-d872f2087c98
  static void LinkProfiles(OtrTestingProfile* profile1,
                           OtrTestingProfile* profile2) {
    profile1->set_linked_profile(profile2);
    profile2->set_linked_profile(profile1);
  }

  static void LinkProfiles(OtrTestingProfile* profile1,
                           OtrTestingProfile* profile2) {
    profile1->set_linked_profile(profile2);
    profile2->set_linked_profile(profile1);
  }
