Set incomplete status when we have continuations that we shouldn't destroy. Fixes assertion on layout/generic/crashtests/469859-1.xhtml . (Bug 563584, patch 30) r=roc

layout/generic/nsBlockFrame.cpp

@@ -2245,6 +2245,7 @@ nsBlockFrame::ReflowDirtyLines(nsBlockReflowState& aState)
           if (aState.mReflowState.WillReflowAgainForClearance()) {
             line->MarkDirty();
             keepGoing = PR_FALSE;
+            NS_FRAME_SET_INCOMPLETE(aState.mReflowStatus);
             break;
           }