Bug 1099110 - Add a runtime check before the downcast in BreakSink::SetCapitalization. r=jfkthame

layout/generic/nsTextFrame.cpp

@@ -972,16 +972,18 @@ public:
     
     virtual void SetCapitalization(uint32_t aOffset, uint32_t aLength,
                                    bool* aCapitalize) MOZ_OVERRIDE {
-      NS_ASSERTION(mTextRun->GetFlags() & nsTextFrameUtils::TEXT_IS_TRANSFORMED,
+      MOZ_ASSERT(mTextRun->GetFlags() & nsTextFrameUtils::TEXT_IS_TRANSFORMED,
                  "Text run should be transformed!");
+      if (mTextRun->GetFlags() & nsTextFrameUtils::TEXT_IS_TRANSFORMED) {
         nsTransformedTextRun* transformedTextRun =
           static_cast<nsTransformedTextRun*>(mTextRun);
         transformedTextRun->SetCapitalization(aOffset + mOffsetIntoTextRun, aLength,
                                               aCapitalize, mContext);
       }
+    }
 
     void Finish(gfxMissingFontRecorder* aMFR) {
-      NS_ASSERTION(!(mTextRun->GetFlags() &
+      MOZ_ASSERT(!(mTextRun->GetFlags() &
                    (gfxTextRunFactory::TEXT_UNUSED_FLAGS |
                     nsTextFrameUtils::TEXT_UNUSED_FLAG)),
                    "Flag set that should never be set! (memory safety error?)");