Pass data saver pref value into embedded worker

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 557b82fad385ea8a07fa75fdbb0d33de632a3ec0..8522ad26d4124dd51889268704199048c274c413 100644
--- a/chrome/browser/chrome_content_browser_client.h
+++ b/chrome/browser/chrome_content_browser_client.h
@@ -25,6 +25,7 @@ class CommandLine;
 }
 
 namespace content {
+class BrowserContext;
 class QuotaPermissionContext;
 }
 
@@ -126,6 +127,7 @@ class ChromeContentBrowserClient : public content::ContentBrowserClient {
   std::string GetApplicationLocale() override;
   std::string GetAcceptLangs(content::BrowserContext* context) override;
   const gfx::ImageSkia* GetDefaultFavicon() override;
+  bool IsDataSaverEnabled(content::BrowserContext* context) override;
   bool AllowAppCache(const GURL& manifest_url,
                      const GURL& first_party,
                      content::ResourceContext* context) override;