Hook up ProfileIOData's URLRequestContext to a NetworkService.

chrome/browser/chrome_content_browser_client.h

Index: chrome/browser/chrome_content_browser_client.h
diff --git a/chrome/browser/chrome_content_browser_client.h b/chrome/browser/chrome_content_browser_client.h
index e5220bc834ca204b2c5e8a4acc9839df14e4419a..009a21666af485951d3a664c14d8bc3b5a0d3251 100644
--- a/chrome/browser/chrome_content_browser_client.h
+++ b/chrome/browser/chrome_content_browser_client.h
@@ -19,6 +19,7 @@
 #include "base/memory/weak_ptr.h"
 #include "build/build_config.h"
 #include "content/public/browser/content_browser_client.h"
+#include "content/public/common/network_service.mojom.h"
 #include "extensions/features/features.h"
 #include "media/media_features.h"
 #include "ppapi/features/features.h"
@@ -320,6 +321,10 @@ class ChromeContentBrowserClient : public content::ContentBrowserClient {
   std::unique_ptr<content::MemoryCoordinatorDelegate>
   GetMemoryCoordinatorDelegate() override;
   ::rappor::RapporService* GetRapporService() override;
+  content::mojom::NetworkContextPtr CreateNetworkContext(
+      content::BrowserContext* context,
+      bool in_memory,
+      const base::FilePath& relative_partition_path) override;
 
 #if BUILDFLAG(ENABLE_MEDIA_REMOTING)
   void CreateMediaRemoter(content::RenderFrameHost* render_frame_host,