Fix -Wnon-virtual-dtor compiler warnings.

This is done by explicitly adding a virtual dtor to interface classes,
since the cost is small given that there are already virtual functions.

The exceptions are for classes that have a Release() or Delete() method,
in which case it is non-virtual and protected to indicate that the virtual
class is never the deletion point.

BUG=
R=brucedawson@chromium.org, thestig@chromium.org

Review URL: https://codereview.chromium.org/810883005

1 files changed, 1 insertions, 0 deletions

diff --git a/core/src/fxcodec/jbig2/JBig2_Module.h b/core/src/fxcodec/jbig2/JBig2_Module.h
index 3a01eb094c..711cf4047b 100644
--- a/core/src/fxcodec/jbig2/JBig2_Module.h
+++ b/core/src/fxcodec/jbig2/JBig2_Module.h
@@ -10,6 +10,7 @@
 class CJBig2_Module
 {
 public:
+    virtual ~CJBig2_Module() { }
 
     virtual void *JBig2_Malloc(FX_DWORD dwSize) = 0;