Add support for not owning distilled WebContents

components/dom_distiller/content/distiller_page_web_contents.h

Index: components/dom_distiller/content/distiller_page_web_contents.h
diff --git a/components/dom_distiller/content/distiller_page_web_contents.h b/components/dom_distiller/content/distiller_page_web_contents.h
index 80b7a9eb800f52954d81556f19249c955b0fd748..82abe8d530c69155b91bee19b31b41d537a743c8 100644
--- a/components/dom_distiller/content/distiller_page_web_contents.h
+++ b/components/dom_distiller/content/distiller_page_web_contents.h
@@ -18,15 +18,17 @@ namespace dom_distiller {
 
 class SourcePageHandleWebContents : public SourcePageHandle {
  public:
-  explicit SourcePageHandleWebContents(
-      scoped_ptr<content::WebContents> web_contents);
+  SourcePageHandleWebContents(content::WebContents* web_contents, bool owned);
   ~SourcePageHandleWebContents() override;
 
-  scoped_ptr<content::WebContents> GetWebContents();
+  // Retreives the WebContents. The SourcePageHandleWebContents keeps ownership.
+  content::WebContents* web_contents() { return web_contents_; }
 
  private:
-  // The WebContents this class owns.
-  scoped_ptr<content::WebContents> web_contents_;
+  // The WebContents this class holds.
+  content::WebContents* web_contents_;
+  // Whether this owns |web_contents_|.
+  bool owned_;
 };
 
 class DistillerPageWebContentsFactory : public DistillerPageFactory {
@@ -106,7 +108,8 @@ class DistillerPageWebContents : public DistillerPage,
   // The JavaScript to inject to extract content.
   std::string script_;
 
-  scoped_ptr<content::WebContents> web_contents_;
+  scoped_ptr<SourcePageHandleWebContents> source_page_handle_;
+
   content::BrowserContext* browser_context_;
   gfx::Size render_view_size_;
   DISALLOW_COPY_AND_ASSIGN(DistillerPageWebContents);