We have a problem in the process on destroying WebContentsImpl because

chrome/browser/ui/tabs/tab_strip_model.cc

Index: chrome/browser/ui/tabs/tab_strip_model.cc
diff --git a/chrome/browser/ui/tabs/tab_strip_model.cc b/chrome/browser/ui/tabs/tab_strip_model.cc
index 06ac829caee55219f88d5b595bef67b64b3762d0..098d89d303ad3d9cef7e7662ddbaec5f78829b3b 100644
--- a/chrome/browser/ui/tabs/tab_strip_model.cc
+++ b/chrome/browser/ui/tabs/tab_strip_model.cc
@@ -73,7 +73,7 @@ class CloseTracker {
 
    private:
     // WebContentsObserver:
-    virtual void WebContentsDestroyed(WebContents* web_contents) OVERRIDE {
+    virtual void WebContentsDestroyed() OVERRIDE {
       parent_->OnWebContentsDestroyed(this);
     }
 
@@ -161,7 +161,7 @@ class TabStripModel::WebContentsData : public content::WebContentsObserver {
  private:
   // Make sure that if someone deletes this WebContents out from under us, it
   // is properly removed from the tab strip.
-  virtual void WebContentsDestroyed(WebContents* web_contents) OVERRIDE;
+  virtual void WebContentsDestroyed() OVERRIDE;
 
   // The WebContents being tracked by this WebContentsData. The
   // WebContentsObserver does keep a reference, but when the WebContents is
@@ -224,13 +224,12 @@ void TabStripModel::WebContentsData::SetWebContents(WebContents* contents) {
   Observe(contents);
 }
 
-void TabStripModel::WebContentsData::WebContentsDestroyed(
-    WebContents* web_contents) {
-  DCHECK_EQ(contents_, web_contents);
+void TabStripModel::WebContentsData::WebContentsDestroyed() {
+  DCHECK_EQ(contents_, web_contents());
 
   // Note that we only detach the contents here, not close it - it's
   // already been closed. We just want to undo our bookkeeping.
-  int index = tab_strip_model_->GetIndexOfWebContents(web_contents);
+  int index = tab_strip_model_->GetIndexOfWebContents(web_contents());
   DCHECK_NE(TabStripModel::kNoTab, index);
   tab_strip_model_->DetachWebContentsAt(index);
 }