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

layout/generic/nsTextFrame.cpp

@@ -972,18 +972,20 @@ public:
     
     virtual void SetCapitalization(uint32_t aOffset, uint32_t aLength,
                                    bool* aCapitalize) MOZ_OVERRIDE {
-      NS_ASSERTION(mTextRun->GetFlags() & nsTextFrameUtils::TEXT_IS_TRANSFORMED,
-                   "Text run should be transformed!");
-      nsTransformedTextRun* transformedTextRun =
-        static_cast<nsTransformedTextRun*>(mTextRun);
-      transformedTextRun->SetCapitalization(aOffset + mOffsetIntoTextRun, aLength,
-                                            aCapitalize, mContext);
+      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() &
-                     (gfxTextRunFactory::TEXT_UNUSED_FLAGS |
-                      nsTextFrameUtils::TEXT_UNUSED_FLAG)),
+      MOZ_ASSERT(!(mTextRun->GetFlags() &
+                   (gfxTextRunFactory::TEXT_UNUSED_FLAGS |
+                    nsTextFrameUtils::TEXT_UNUSED_FLAG)),
                    "Flag set that should never be set! (memory safety error?)");
       if (mTextRun->GetFlags() & nsTextFrameUtils::TEXT_IS_TRANSFORMED) {
         nsTransformedTextRun* transformedTextRun =