Reset scoped_ptr to make plugin crash on higher level.

pdf/instance.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "pdf/instance.h"
 
 #include <algorithm>  // for min()
 #define _USE_MATH_DEFINES  // for M_PI
 #include <cmath>      // for log() and pow()
 #include <math.h>
@@ skipping 290 matching lines @@
   AddPerInstanceObject(kPPPPdfInterface, this);
 
   RequestFilteringInputEvents(PP_INPUTEVENT_CLASS_MOUSE);
   RequestFilteringInputEvents(PP_INPUTEVENT_CLASS_WHEEL);
   RequestFilteringInputEvents(PP_INPUTEVENT_CLASS_KEYBOARD);
   RequestFilteringInputEvents(PP_INPUTEVENT_CLASS_TOUCH);
 }
 
 Instance::~Instance() {
   RemovePerInstanceObject(kPPPPdfInterface, this);
+  // TODO(vitalybuka): remove after crbug.com/372095 fixed.
+  // Reset to NULL to make it crash in HandleDocumentLoad if called for
+  // deleted instance. scoped_ptr::~scoped_ptr does not reset pointer to NULL.
+  engine_.reset();
 }
 
 bool Instance::Init(uint32_t argc, const char* argn[], const char* argv[]) {
   // For now, we hide HiDPI support behind a flag.
   if (pp::PDF::IsFeatureEnabled(this, PP_PDFFEATURE_HIDPI))
     hidpi_enabled_ = true;
 
   printing_enabled_ = pp::PDF::IsFeatureEnabled(this, PP_PDFFEATURE_PRINTING);
   if (printing_enabled_) {
     CreateToolbar(kPDFToolbarButtons, arraysize(kPDFToolbarButtons));
@@ skipping 2389 matching lines @@
   return instance_->HasScriptableMethod(name, exception);
 }
 
 pp::Var PDFScriptableObject::Call(const pp::Var& method,
                                   const std::vector<pp::Var>& args,
                                   pp::Var* exception) {
   return instance_->CallScriptableMethod(method, args, exception);
 }
 
 }  // namespace chrome_pdf