Fix auto raw pointer deduction on linux

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 "tools/gn/err.h"
 #include "tools/gn/parse_tree.h"
 #include "tools/gn/scheduler.h"
 #include "tools/gn/scope_per_file_provider.h"
@@ skipping 93 matching lines @@
         return false;
       }
     } else {
       // Add trace if this thread was blocked for a long period of time and did
       // not load the import itself.
       base::TimeTicks import_block_end = base::TimeTicks::Now();
       constexpr auto kImportBlockTraceThreshold =
           base::TimeDelta::FromMilliseconds(20);
       if (TracingEnabled() &&
           import_block_end - import_block_begin > kImportBlockTraceThreshold) {
-        auto import_block_trace =
+        auto* import_block_trace =
             new TraceItem(TraceItem::TRACE_IMPORT_BLOCK, file.value(),
                           base::PlatformThread::CurrentId());
         import_block_trace->set_begin(import_block_begin);
         import_block_trace->set_end(import_block_end);
         AddTrace(import_block_trace);
       }
     }
 
     // Promote the now-read-only scope to outside the load lock.
     import_scope = import_info->scope.get();
   }
 
   Scope::MergeOptions options;
   options.skip_private_vars = true;
   options.mark_dest_used = true;  // Don't require all imported values be used.
   return import_scope->NonRecursiveMergeTo(scope, options, node_for_err,
                                            "import", err);
 }
 
 std::vector<SourceFile> ImportManager::GetImportedFiles() const {
   std::vector<SourceFile> imported_files;
   imported_files.resize(imports_.size());
   std::transform(imports_.begin(), imports_.end(), imported_files.begin(),
                  [](const ImportMap::value_type& val) { return val.first; });
   return imported_files;
 }