Reland of Pass SequencedTaskRunner to PowerSaveBlocker for ui/file ops

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 77 matching lines @@
     "+content/public/browser/browser_thread.h",  # Only for DCHECK.
     "+content/public/browser/content_browser_client.h",  # To get NetLog.
     "+content/public/common/resource_devtools_info.h",
   ],
   "power_save_block_resource_throttle\.(cc|h)": [
     "-content",
     "+content/browser/loader/power_save_block_resource_throttle.h",
     "+content/public/browser/resource_throttle.h",
 
     # TODO: these all have to be removed.
-    "+content/public/browser/power_save_blocker.h",
+    "+content/public/browser/power_save_blocker_factory.h",
   ],
   "resource_dispatcher_host_impl\.(cc|h)": [
     "-content",
     "+content/browser/loader/async_resource_handler.h",
     "+content/browser/loader/async_revalidation_manager.h",
     "+content/browser/loader/global_routing_id.h",
     "+content/browser/loader/power_save_block_resource_throttle.h",
     "+content/browser/loader/resource_dispatcher_host_impl.h",
     "+content/browser/loader/resource_loader.h",
     "+content/browser/loader/resource_loader_delegate.h",
@@ skipping 166 matching lines @@
     "+content/browser/loader/sync_resource_handler.h",
     "+content/public/browser/resource_dispatcher_host_delegate.h",
     "+content/public/browser/resource_request_info.h",
     "+content/public/common/resource_response.h",
 
 
     # TODO: To be replaced by mojo.
     "+content/common/resource_messages.h",
   ],
 }