Remove SupportsUserData from ResourceRequestBodyImpl.

content/browser/loader/resource_request_info_impl.h

Index: content/browser/loader/resource_request_info_impl.h
diff --git a/content/browser/loader/resource_request_info_impl.h b/content/browser/loader/resource_request_info_impl.h
index d9dac75d25610e48459a7dfab25e535e2a1e5eaf..18a37243690219bc5f994b4ce9e11ca95dfc2602 100644
--- a/content/browser/loader/resource_request_info_impl.h
+++ b/content/browser/loader/resource_request_info_impl.h
@@ -14,6 +14,7 @@
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
 #include "base/supports_user_data.h"
+#include "content/browser/blob_storage/chrome_blob_storage_context.h"
 #include "content/browser/loader/resource_requester_info.h"
 #include "content/common/resource_request_body_impl.h"
 #include "content/common/url_loader.mojom.h"
@@ -200,6 +201,8 @@ class ResourceRequestInfoImpl : public ResourceRequestInfo,
     on_transfer_ = on_transfer;
   }
 
+  void SetBlobHandles(BlobHandles blob_handles);
+
  private:
   FRIEND_TEST_ALL_PREFIXES(ResourceDispatcherHostTest,
                            DeletedFilterDetached);
@@ -239,6 +242,9 @@ class ResourceRequestInfoImpl : public ResourceRequestInfo,
   bool initiated_in_secure_context_;
   std::unique_ptr<NavigationUIData> navigation_ui_data_;
 
+  // Keeps blobs alive for the duration of the request.

[kinuko, 2017/06/28 01:43:28]

Could we also briefly note that it's for uploading?

[mmenke, 2017/06/28 17:31:37]

Done.

+  BlobHandles blob_handles_;
+
   // This callback is set by MojoAsyncResourceHandler to update its mojo binding
   // and remote endpoint. This callback will be removed once PlzNavigate is
   // shipped.