Reduce/remove usage of BrowserThread in content/browser/loader.

content/browser/loader/DEPS

Index: content/browser/loader/DEPS
diff --git a/content/browser/loader/DEPS b/content/browser/loader/DEPS
index a144d1675bf9938551a631751433fd63f6a3de04..f79c1c7f9d8d086682b2ae8d855e61249a39a931 100644
--- a/content/browser/loader/DEPS
+++ b/content/browser/loader/DEPS
@@ -117,6 +117,7 @@ specific_include_rules = {
     "+content/browser/loader/async_resource_handler.h",
     "+content/browser/loader/global_routing_id.h",
     "+content/browser/loader/loader_delegate.h",
+    "+content/browser/loader/loader_globals.h",
     "+content/browser/loader/mojo_async_resource_handler.h",
     "+content/browser/loader/null_resource_controller.h",
     "+content/browser/loader/power_save_block_resource_throttle.h",
@@ -195,6 +196,7 @@ specific_include_rules = {
   ],
   "resource_loader\.(cc|h)": [
     "-content",
+    "+content/browser/loader/loader_globals.h",
     "+content/browser/loader/resource_controller.h",
     "+content/browser/loader/resource_handler.h",
     "+content/browser/loader/resource_loader.h",
@@ -226,6 +228,7 @@ specific_include_rules = {
   "resource_request_info_impl\.(cc|h)": [
     "-content",
     "+content/browser/loader/global_routing_id.h",
+    "+content/browser/loader/loader_globals.h",
     "+content/browser/loader/resource_handler.h",
     "+content/browser/loader/resource_message_filter.h",
     "+content/browser/loader/resource_request_info_impl.h",
@@ -251,6 +254,7 @@ specific_include_rules = {
   ],
   "resource_requester_info\.(cc|h)": [
     "-content",
+    "+content/browser/loader/loader_globals.h",
     "+content/browser/loader/resource_controller.h",
     "+content/browser/loader/resource_requester_info.h",
     "+content/common/content_export.h",
@@ -317,6 +321,7 @@ specific_include_rules = {
   ],
   "url_loader_factory_impl\.(cc|h)": [
     "-content",
+    "+content/browser/loader/loader_globals.h",
     "+content/browser/loader/resource_dispatcher_host_impl.h",
     "+content/browser/loader/resource_requester_info.h",
     "+content/browser/loader/url_loader_factory_impl.h",
@@ -324,7 +329,6 @@ specific_include_rules = {
     "+content/common/resource_request.h",
     "+content/common/url_loader.mojom.h",
     "+content/common/url_loader_factory.mojom.h",
-    "+content/public/browser/browser_thread.h",
   ],
   "url_loader_factory_impl_unittest\.cc": [
     "-content",