Remove WeakPtrFactory from PepperFileSystemHost

PepperFileSystemHost already inherits SupportsWeakPtr.
Hence, instead of creating a WeakPtrFactory instance to
access its weak pointer, we can directly use AsWeakPtr().

BUG=None

Change-Id: I97e716d9ceb479e02ae7b80ea77fe1eaf7bf28b0
Reviewed-on: https://chromium-review.googlesource.com/590342Reviewed-by: Bill Budge <bbudge@chromium.org>
Commit-Queue: SUCHIT AGRAWAL <a.suchit@chromium.org>
Cr-Commit-Position: refs/heads/master@{#490664}

content/renderer/pepper/pepper_file_system_host.cc

@@ -33,8 +33,7 @@ PepperFileSystemHost::PepperFileSystemHost(RendererPpapiHost* host,
       renderer_ppapi_host_(host),
       type_(type),
       opened_(false),
-      called_open_(false),
-      weak_factory_(this) {}
+      called_open_(false) {}
 
 PepperFileSystemHost::PepperFileSystemHost(RendererPpapiHost* host,
                                            PP_Instance instance,
@@ -46,8 +45,7 @@ PepperFileSystemHost::PepperFileSystemHost(RendererPpapiHost* host,
       type_(type),
       opened_(true),
       root_url_(root_url),
-      called_open_(true),
-      weak_factory_(this) {}
+      called_open_(true) {}
 
 PepperFileSystemHost::~PepperFileSystemHost() {}
 
@@ -105,12 +103,9 @@ int32_t PepperFileSystemHost::OnHostMsgOpen(
       ChildThreadImpl::current()->file_system_dispatcher();
   reply_context_ = context->MakeReplyMessageContext();
   file_system_dispatcher->OpenFileSystem(
-      document_url.GetOrigin(),
-      file_system_type,
-      base::Bind(&PepperFileSystemHost::DidOpenFileSystem,
-                 weak_factory_.GetWeakPtr()),
-      base::Bind(&PepperFileSystemHost::DidFailOpenFileSystem,
-                 weak_factory_.GetWeakPtr()));
+      document_url.GetOrigin(), file_system_type,
+      base::Bind(&PepperFileSystemHost::DidOpenFileSystem, AsWeakPtr()),
+      base::Bind(&PepperFileSystemHost::DidFailOpenFileSystem, AsWeakPtr()));
   return PP_OK_COMPLETIONPENDING;
 }
 

content/renderer/pepper/pepper_file_system_host.h

@@ -74,8 +74,6 @@ class PepperFileSystemHost
   GURL root_url_;
   bool called_open_;  // whether open has been called.
 
-  base::WeakPtrFactory<PepperFileSystemHost> weak_factory_;
-
   DISALLOW_COPY_AND_ASSIGN(PepperFileSystemHost);
 };