Simplify BrowserContext by removing redundant methods.

extensions/browser/api/sockets_tcp/sockets_tcp_api.cc

Index: extensions/browser/api/sockets_tcp/sockets_tcp_api.cc
diff --git a/extensions/browser/api/sockets_tcp/sockets_tcp_api.cc b/extensions/browser/api/sockets_tcp/sockets_tcp_api.cc
index be36153cbbc87f1e00f0066fe2b853c0227300e5..4acbf8892491247d38d2847af98016030c83b613 100644
--- a/extensions/browser/api/sockets_tcp/sockets_tcp_api.cc
+++ b/extensions/browser/api/sockets_tcp/sockets_tcp_api.cc
@@ -5,6 +5,7 @@
 #include "extensions/browser/api/sockets_tcp/sockets_tcp_api.h"
 
 #include "content/public/browser/browser_context.h"
+#include "content/public/browser/storage_partition.h"
 #include "content/public/common/socket_permission_request.h"
 #include "extensions/browser/api/socket/tcp_socket.h"
 #include "extensions/browser/api/socket/tls_socket.h"
@@ -455,7 +456,8 @@ bool SocketsTcpSecureFunction::Prepare() {
   DCHECK_CURRENTLY_ON(content::BrowserThread::UI);
   params_ = api::sockets_tcp::Secure::Params::Create(*args_);
   EXTENSION_FUNCTION_VALIDATE(params_.get());
-  url_request_getter_ = browser_context()->GetRequestContext();
+  url_request_getter_ = content::BrowserContext::GetDefaultStoragePartition(
+      browser_context())->GetURLRequestContext();
   return true;
 }