Split infobars.{cc,h} into separate pieces for the different classes defined within, so that each piece is shorter and clearer.

BUG=none
TEST=none
Review URL: http://codereview.chromium.org/6250057

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@73235 0039d316-1c4b-4281-b951-d872f2087c98
 void InfoBarContainer::UpdateInfoBars() {
   for (int i = 0; i < tab_contents_->infobar_delegate_count(); ++i) {
     InfoBarDelegate* delegate = tab_contents_->GetInfoBarDelegateAt(i);
    InfoBarView* infobar = static_cast<InfoBarView*>(delegate->CreateInfoBar());
     infobar->set_container(this);
     AddChildView(infobar);
     infobar->Open();
  }
}

 void InfoBarContainer::UpdateInfoBars() {
   for (int i = 0; i < tab_contents_->infobar_delegate_count(); ++i) {
     InfoBarDelegate* delegate = tab_contents_->GetInfoBarDelegateAt(i);
    InfoBar* infobar = delegate->CreateInfoBar();
     infobar->set_container(this);
     AddChildView(infobar);
     infobar->Open();
  }
}
