Remove SupportsUserData from ResourceRequestBodyImpl.

content/browser/loader/DEPS

 # The core loading code in this directory is being transitioned into a separate
 # Mojo networking service. See http://crbug.com/598073. The first stage is to
 # decouple the code that will be moved from the rest of content. These rules
 # help ensure that we don't add more includes, and can progressively reduce the
 # code's dependencies.
 #
 # For each file, the first section shows includes that are allowed (i.e. because
 # they are for files that will be moving as well). The second section, separated
 # by a comment, lists files that we will have to decouple.
 specific_include_rules = {
@@ skipping 205 matching lines @@
     "+content/browser/service_worker/service_worker_response_info.h",
     "+content/browser/ssl/ssl_manager.h",
     "+content/public/common/content_client.h",
     "+content/public/common/content_switches.h",
   ],
   "resource_handler_delegate\.h": [
     "-content",
   ],
   "resource_request_info_impl\.(cc|h)": [
     "-content",
+    "+content/browser/blob_storage/chrome_blob_storage_context.h",
     "+content/browser/loader/global_routing_id.h",
     "+content/browser/loader/resource_handler.h",
     "+content/browser/loader/resource_message_filter.h",
     "+content/browser/loader/resource_request_info_impl.h",
     "+content/browser/loader/resource_requester_info.h",
     "+content/common/content_export.h",
     "+content/common/resource_request_body_impl.h",
     "+content/common/url_loader.mojom.h",
     "+content/public/browser/global_request_id.h",
     "+content/public/browser/resource_request_info.h",
@@ skipping 111 matching lines @@
     "+content/browser/loader/navigation_resource_throttle.h"
   ],
   "wake_lock_resource_throttle\.(cc|h)": [
     "-content",
     "+content/browser/loader/wake_lock_resource_throttle.h",
     "+content/browser/service_manager/service_manager_context.h",
     "+content/public/browser/browser_thread.h",
     "+content/public/browser/resource_throttle.h",
   ],
 }