Convert Pass()→std::move() in //tools

tools/gn/scope.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/scope.h"
 
 #include "base/logging.h"
 #include "base/stl_util.h"
 #include "tools/gn/parse_tree.h"
 #include "tools/gn/template.h"
@@ skipping 359 matching lines @@
   // Want to clobber since we've flattened some nested scopes, and our parent
   // scope may have a duplicate value set.
   MergeOptions options;
   options.clobber_existing = true;
 
   // Add in our variables and we're done.
   Err err;
   NonRecursiveMergeTo(result.get(), options, nullptr, "<SHOULDN'T HAPPEN>",
                       &err);
   DCHECK(!err.has_error());
-  return result.Pass();
+  return result;
 }
 
 Scope* Scope::MakeTargetDefaults(const std::string& target_type) {
   if (GetTargetDefaults(target_type))
     return nullptr;
 
   Scope** dest = &target_defaults_[target_type];
   if (*dest) {
     NOTREACHED();  // Already set.
     return *dest;
@@ skipping 93 matching lines @@
 }
 
 void Scope::AddProvider(ProgrammaticProvider* p) {
   programmatic_providers_.insert(p);
 }
 
 void Scope::RemoveProvider(ProgrammaticProvider* p) {
   DCHECK(programmatic_providers_.find(p) != programmatic_providers_.end());
   programmatic_providers_.erase(p);
 }