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::Layout() {
  int top = 0;
  for (int i = 0; i < GetChildViewCount(); ++i) {
    views::View* child = GetChildViewAt(i);
    gfx::Size ps = child->GetPreferredSize();
    child->SetBounds(0, top, width(), ps.height());
    top += ps.height();
  }
}

void InfoBarContainer::Layout() {
  int top = 0;
  for (int i = 0; i < GetChildViewCount(); ++i) {
    views::View* child = GetChildViewAt(i);
    gfx::Size ps = child->GetPreferredSize();
    child->SetBounds(0, top, width(), ps.height());
    top += ps.height();
  }
}
