Disable JBIG2 cache; prevent data corruption

core/src/fxcodec/jbig2/JBig2_Context.cpp

Index: core/src/fxcodec/jbig2/JBig2_Context.cpp
diff --git a/core/src/fxcodec/jbig2/JBig2_Context.cpp b/core/src/fxcodec/jbig2/JBig2_Context.cpp
index bd2421e3f94715255a25093a2ad118e342e2afd4..9f9796d9016010903c401b24e1ae28273f2e47d7 100644
--- a/core/src/fxcodec/jbig2/JBig2_Context.cpp
+++ b/core/src/fxcodec/jbig2/JBig2_Context.cpp
@@ -22,7 +22,9 @@
 // list keeps track of the freshness of entries, with freshest ones
 // at the front. Even a tiny cache size like 2 makes a dramatic
 // difference for typical JBIG2 documents.
-static const int kSymbolDictCacheMaxSize = 2;
+
+// Disable until we can figure out how to clear cache between documents.
+static const int kSymbolDictCacheMaxSize = 0;
 
 CJBig2_Context* CJBig2_Context::CreateContext(
     const uint8_t* pGlobalData,