Backout 783daf190579 (Bug 680085). Could be causing talos deviation.

layout/generic/nsTextFrameThebes.cpp

@@ -7608,11 +7608,6 @@ nsresult nsTextFrame::GetRenderedText(nsAString* aAppendToString,
        textFrame = static_cast<nsTextFrame*>(textFrame->GetNextContinuation())) {
     // For each text frame continuation in this block ...
 
-    if (textFrame->GetStateBits() & NS_FRAME_IS_DIRTY) {
-      // We don't trust dirty frames, expecially when computing rendered text.
-      break;
-    }
-
     // Ensure the text run and grab the gfxSkipCharsIterator for it
     gfxSkipCharsIterator iter = textFrame->EnsureTextRun();
     if (!textFrame->mTextRun)