Bug 1121738 - Ruby base container frames should not support CSS transforms. r=xidorn

Following bug 1055667 patch 5, nsRubyBaseContainerFrame is the only ruby
frame type with this bug.  It should not support CSS transforms given
the spec wording in
http://dev.w3.org/csswg/css-transforms/#transformable-element

layout/generic/nsRubyBaseContainerFrame.cpp

@@ -265,6 +265,9 @@ nsRubyBaseContainerFrame::AddInlinePrefISize(
 /* virtual */ bool 
 nsRubyBaseContainerFrame::IsFrameOfType(uint32_t aFlags) const 
 {
+  if (aFlags & eSupportsCSSTransforms) {
+    return false;
+  }
   return nsContainerFrame::IsFrameOfType(aFlags &
          ~(nsIFrame::eLineParticipant));
 }