Convert //tools to use std::unique_ptr

tools/gn/setup.cc

Index: tools/gn/setup.cc
diff --git a/tools/gn/setup.cc b/tools/gn/setup.cc
index 966150614915aca0f5f177bdcbe25a1bc45377e2..384a2af17eaaa00368fbc8d0dfccc64f1fd2df86 100644
--- a/tools/gn/setup.cc
+++ b/tools/gn/setup.cc
@@ -140,7 +140,7 @@ base::FilePath FindDotFile(const base::FilePath& current_dir) {
 // Called on any thread. Post the item to the builder on the main thread.
 void ItemDefinedCallback(base::MessageLoop* main_loop,
                          scoped_refptr<Builder> builder,
-                         scoped_ptr<Item> item) {
+                         std::unique_ptr<Item> item) {
   DCHECK(item);
   main_loop->PostTask(FROM_HERE, base::Bind(&Builder::ItemDefined, builder,
                                             base::Passed(&item)));
@@ -199,7 +199,7 @@ base::FilePath FindWindowsPython() {
   DWORD path_length = ::GetEnvironmentVariable(kPathEnvVarName, nullptr, 0);
   if (path_length == 0)
     return base::FilePath();
-  scoped_ptr<base::char16[]> full_path(new base::char16[path_length]);
+  std::unique_ptr<base::char16[]> full_path(new base::char16[path_length]);
   DWORD actual_path_length =
       ::GetEnvironmentVariable(kPathEnvVarName, full_path.get(), path_length);
   CHECK_EQ(path_length, actual_path_length + 1);
@@ -712,7 +712,7 @@ bool Setup::FillOtherConfig(const base::CommandLine& cmdline) {
       err.PrintToStdout();
       return false;
     }
-    scoped_ptr<std::set<SourceFile>> whitelist(new std::set<SourceFile>);
+    std::unique_ptr<std::set<SourceFile>> whitelist(new std::set<SourceFile>);
     for (const auto& item : exec_script_whitelist_value->list_value()) {
       if (!item.VerifyTypeIs(Value::STRING, &err)) {
         err.PrintToStdout();