Convert //tools to use std::unique_ptr

tools/gn/import_manager.cc

 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "tools/gn/import_manager.h"
 
-#include "base/memory/scoped_ptr.h"
+#include <memory>
+
 #include "base/stl_util.h"
 #include "tools/gn/parse_tree.h"
 #include "tools/gn/scheduler.h"
 #include "tools/gn/scope_per_file_provider.h"
 
 namespace {
 
 // Returns a newly-allocated scope on success, null on failure.
 Scope* UncachedImport(const Settings* settings,
                       const SourceFile& file,
                       const ParseNode* node_for_err,
                       Err* err) {
   const ParseNode* node = g_scheduler->input_file_manager()->SyncLoadFile(
       node_for_err->GetRange(), settings->build_settings(), file, err);
   if (!node)
     return nullptr;
 
-  scoped_ptr<Scope> scope(new Scope(settings->base_config()));
+  std::unique_ptr<Scope> scope(new Scope(settings->base_config()));
   scope->set_source_dir(file.GetDir());
 
   // Don't allow ScopePerFileProvider to provide target-related variables.
   // These will be relative to the imported file, which is probably not what
   // people mean when they use these.
   ScopePerFileProvider per_file_provider(scope.get(), false);
 
   scope->SetProcessingImport();
   node->Execute(scope.get(), err);
   if (err->has_error())
@@ skipping 47 matching lines @@
       }
     }
   }
 
   Scope::MergeOptions options;
   options.skip_private_vars = true;
   options.mark_dest_used = true;  // Don't require all imported values be used.
   return imported_scope->NonRecursiveMergeTo(scope, options, node_for_err,
                                              "import", err);
 }