Pickle: handle invalid data on 64 bit systems....

base/pickle.h

Index: base/pickle.h
===================================================================
--- base/pickle.h	(revision 65620)
+++ base/pickle.h	(working copy)
@@ -177,10 +177,12 @@
   // Returns the address of the byte immediately following the currently valid
   // header + payload.
   char* end_of_payload() {
+    // We must have a valid header_.
     return payload() + payload_size();
   }
   const char* end_of_payload() const {
-    return payload() + payload_size();
+    // This object may be invalid.
+    return header_ ? payload() + payload_size() : NULL;
   }
 
   size_t capacity() const {