Fix a crash in pdf::PepperPDFHost::OnHostMsgHasUnsupportedFeature().

components/pdf/renderer/pepper_pdf_host.h

 // Copyright 2014 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.
 
 #ifndef COMPONENTS_PDF_RENDERER_PEPPER_PDF_HOST_H_
 #define COMPONENTS_PDF_RENDERER_PEPPER_PDF_HOST_H_
 
 #include <stdint.h>
 
+#include <memory>
 #include <string>
+#include <vector>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/strings/string16.h"
 #include "ipc/ipc_platform_file.h"
 #include "ppapi/c/ppb_image_data.h"
 #include "ppapi/c/private/ppb_pdf.h"
 #include "ppapi/host/resource_host.h"
 #include "ppapi/proxy/serialized_structs.h"
 
 struct PP_ImageDataDesc;
 struct PP_Size;
 class SkBitmap;
 
 namespace content {
 class PepperPluginInstance;
+class RenderView;
 class RendererPpapiHost;
 }
 
 namespace ppapi {
 class HostResource;
-}
 
-namespace ppapi {
 namespace host {
 struct HostMessageContext;
-}
-}
+}  // namespace host
+}  // namespace ppapi
 
 namespace pdf {
 
 class PdfAccessibilityTree;
 
 class PepperPDFHost : public ppapi::host::ResourceHost {
  public:
   class PrintClient {
    public:
     virtual ~PrintClient() {}
@@ skipping 15 matching lines @@
   // Invokes the "Print" command for the given instance as if the user right
   // clicked on it and selected "Print". Returns if the "Print" command was
   // issued or not.
   static bool InvokePrintingForInstance(PP_Instance instance);
 
   // The caller retains the ownership of |print_client|. The client is
   // allowed to be set only once, and when set, the client must outlive the
   // PPB_PDF_Impl instance.
   static void SetPrintClient(PrintClient* print_client);
 
+  // ppapi::host::ResourceHost:
   int32_t OnResourceMessageReceived(
       const IPC::Message& msg,
       ppapi::host::HostMessageContext* context) override;
 
  private:
   int32_t OnHostMsgDidStartLoading(ppapi::host::HostMessageContext* context);
   int32_t OnHostMsgDidStopLoading(ppapi::host::HostMessageContext* context);
   int32_t OnHostMsgSetContentRestriction(
       ppapi::host::HostMessageContext* context,
       int restrictions);
@@ skipping 15 matching lines @@
       ppapi::host::HostMessageContext* context,
       const PP_PrivateAccessibilityDocInfo& doc_info);
   int32_t OnHostMsgSetAccessibilityPageInfo(
       ppapi::host::HostMessageContext* context,
       const PP_PrivateAccessibilityPageInfo& page_info,
       const std::vector<PP_PrivateAccessibilityTextRunInfo>& text_runs,
       const std::vector<PP_PrivateAccessibilityCharInfo>& chars);
 
   void CreatePdfAccessibilityTreeIfNeeded();
 
+  content::RenderView* GetRenderView();
+
   std::unique_ptr<PdfAccessibilityTree> pdf_accessibility_tree_;
 
-  content::RendererPpapiHost* host_;
+  content::RendererPpapiHost* const host_;
 
   DISALLOW_COPY_AND_ASSIGN(PepperPDFHost);
 };
 
 }  // namespace pdf
 
 #endif  // COMPONENTS_PDF_RENDERER_PEPPER_PDF_HOST_H_