merge to XFA: Fix -Wnon-virtual-dtor compiler warnings.

Original at URL: https://codereview.chromium.org/810883005

Note that the new code in XFA introduces many more of these, to be handled
separately.

TBR=brucedawson@chromium.org
TBR=thestig@chromium.org

BUG=https://code.google.com/p/pdfium/issues/detail?id=102

Review URL: https://codereview.chromium.org/842223004
diff --git a/fpdfsdk/include/javascript/IJavaScript.h b/fpdfsdk/include/javascript/IJavaScript.h
index 7754537..fbd89d2 100644
--- a/fpdfsdk/include/javascript/IJavaScript.h
+++ b/fpdfsdk/include/javascript/IJavaScript.h
@@ -11,13 +11,13 @@
 class Platform;
 }
 
-class IFXJS_Context  
+class IFXJS_Context
 {
 public:
+        virtual ~IFXJS_Context() { }
 	virtual FX_BOOL				Compile(const CFX_WideString& script, CFX_WideString& info) = 0;
 	virtual FX_BOOL				RunScript(const CFX_WideString& script, CFX_WideString& info) = 0;
 
-public:
 	virtual void				OnApp_Init() = 0;
 
 	virtual void				OnDoc_Open(CPDFSDK_Document* pDoc, const CFX_WideString& strTargetName) = 0;
@@ -31,7 +31,7 @@
 	virtual void				OnPage_Close(CPDFSDK_Document* pTarget) = 0;
 	virtual void				OnPage_InView(CPDFSDK_Document* pTarget) = 0;
 	virtual void				OnPage_OutView(CPDFSDK_Document* pTarget) = 0;
-	
+
 	virtual void				OnField_MouseDown(FX_BOOL bModifier, FX_BOOL bShift, CPDF_FormField* pTarget) = 0;
 	virtual void				OnField_MouseEnter(FX_BOOL bModifier, FX_BOOL bShift, CPDF_FormField* pTarget) = 0;
 	virtual void				OnField_MouseExit(FX_BOOL bModifier, FX_BOOL bShift, CPDF_FormField* pTarget) = 0;
@@ -90,6 +90,9 @@
 	virtual FX_BOOL				IsEntered() = 0;
 	virtual	FX_BOOL				GetHValueByName(FX_BSTR utf8Name, FXJSE_HVALUE hValue) = 0;
 	virtual	FX_BOOL				SetHValueByName(FX_BSTR utf8Name, FXJSE_HVALUE hValue) = 0;
+
+protected:
+         ~IFXJS_Runtime() { }
 };
 
 class CPDFDoc_Environment;