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

5 files changed, 10 insertions, 0 deletions

diff --git a/fpdfsdk/include/pdfwindow/PWL_Edit.h b/fpdfsdk/include/pdfwindow/PWL_Edit.h
index d86cb77d2c..7a4caaa6ef 100644
--- a/fpdfsdk/include/pdfwindow/PWL_Edit.h
+++ b/fpdfsdk/include/pdfwindow/PWL_Edit.h
@@ -14,6 +14,7 @@ class IPWL_SpellCheck;
 class IPWL_Filler_Notify
 {
 public:
+        virtual ~IPWL_Filler_Notify() { }
 	virtual void					QueryWherePopup(void* pPrivateData, FX_FLOAT fPopupMin,FX_FLOAT fPopupMax, 
 										FX_INT32 & nRet, FX_FLOAT & fPopupRet) = 0; //nRet: (0:bottom 1:top)
 	virtual void					OnBeforeKeyStroke(FX_BOOL bEditOrList, void* pPrivateData, FX_INT32 nKeyCode,
diff --git a/fpdfsdk/include/pdfwindow/PWL_EditCtrl.h b/fpdfsdk/include/pdfwindow/PWL_EditCtrl.h
index b13d5e1e79..c9d87b217c 100644
--- a/fpdfsdk/include/pdfwindow/PWL_EditCtrl.h
+++ b/fpdfsdk/include/pdfwindow/PWL_EditCtrl.h
@@ -30,6 +30,7 @@ class CPWL_Edit;
 class IPWL_Edit_Notify
 {
 public:
+        virtual ~IPWL_Edit_Notify() { }
 	//when the position of caret is changed in edit
 	virtual void					OnCaretMove(FX_INT32 x1, FX_INT32 y1, FX_INT32 x2, FX_INT32 y2) {}
 	virtual void					OnContentChange(const CPDF_Rect& rcContent){}
diff --git a/fpdfsdk/include/pdfwindow/PWL_IconList.h b/fpdfsdk/include/pdfwindow/PWL_IconList.h
index effabd0713..6b3d577504 100644
--- a/fpdfsdk/include/pdfwindow/PWL_IconList.h
+++ b/fpdfsdk/include/pdfwindow/PWL_IconList.h
@@ -16,6 +16,7 @@ class CPWL_Label;
 class IPWL_IconList_Notify
 {
 public:
+        virtual ~IPWL_IconList_Notify() { }
 	virtual void						OnNoteListSelChanged(FX_INT32 nItemIndex) = 0;
 };
 
diff --git a/fpdfsdk/include/pdfwindow/PWL_Note.h b/fpdfsdk/include/pdfwindow/PWL_Note.h
index b3f73581b1..125271f48f 100644
--- a/fpdfsdk/include/pdfwindow/PWL_Note.h
+++ b/fpdfsdk/include/pdfwindow/PWL_Note.h
@@ -27,6 +27,7 @@ class IPopup_Note;
 class IPWL_NoteNotify
 {
 public:
+	virtual ~IPWL_NoteNotify() { }
 	virtual void						OnNoteMove(const FX_RECT& rtWin) = 0;
 	virtual void						OnNoteShow(FX_BOOL bShow) = 0;
 	virtual void						OnNoteActivate(FX_BOOL bActive) = 0;
@@ -45,12 +46,14 @@ public:
 class IPWL_NoteHandler
 {
 public:
+	virtual ~IPWL_NoteHandler() { }
 	virtual void						OnNoteColorChanged(const CPWL_Color& color) = 0;
 };
 
 class IPWL_NoteItem
 {
 public:
+	virtual ~IPWL_NoteItem() { }
 	virtual void						SetPrivateData(void* pData) = 0;
 	virtual void						SetBkColor(const CPWL_Color& color) = 0;
 	virtual void						SetSubjectName(const CFX_WideString& sName) = 0;
diff --git a/fpdfsdk/include/pdfwindow/PWL_Wnd.h b/fpdfsdk/include/pdfwindow/PWL_Wnd.h
index c3dd9b7a70..51a3058993 100644
--- a/fpdfsdk/include/pdfwindow/PWL_Wnd.h
+++ b/fpdfsdk/include/pdfwindow/PWL_Wnd.h
@@ -168,6 +168,7 @@ inline FX_BOOL operator != (const CPWL_Color &c1, const CPWL_Color &c2)
 class IPWL_SpellCheck
 {
 public:
+        virtual ~IPWL_SpellCheck() { }
 	virtual FX_BOOL							CheckWord(FX_LPCSTR sWord) = 0;
 	virtual void							SuggestWords(FX_LPCSTR sWord, CFX_ByteStringArray & sSuggest) = 0;	
 };
@@ -175,6 +176,8 @@ public:
 class IPWL_Provider
 {
 public:
+        virtual ~IPWL_Provider() { }
+
 	//get a matrix which map user space to CWnd client space
 	virtual CPDF_Matrix						GetWindowMatrix(void* pAttachedData) = 0;
 
@@ -193,6 +196,7 @@ public:
 class IPWL_FocusHandler
 {
 public:
+        virtual ~IPWL_FocusHandler() { }
 	virtual void							OnSetFocus(CPWL_Wnd* pWnd) = 0;
 	virtual void							OnKillFocus(CPWL_Wnd* pWnd) = 0;
 };