base: Remove some unnecessary const scoped_refptr<>&.

base/trace_event/process_memory_dump.cc

 // Copyright 2015 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 "base/trace_event/process_memory_dump.h"
 
 #include <errno.h>
 #include <vector>
 
 #include "base/process/process_metrics.h"
@@ skipping 103 matching lines @@
   DCHECK(!failure);
   if (failure) {
     total_resident_size = 0;
     LOG(ERROR) << "CountResidentBytes failed. The resident size is invalid";
   }
   return total_resident_size;
 }
 #endif  // defined(COUNT_RESIDENT_BYTES_SUPPORTED)
 
 ProcessMemoryDump::ProcessMemoryDump(
-    const scoped_refptr<MemoryDumpSessionState>& session_state)
+    scoped_refptr<MemoryDumpSessionState> session_state)
     : has_process_totals_(false),
       has_process_mmaps_(false),
-      session_state_(session_state) {}
+      session_state_(std::move(session_state)) {}
 
 ProcessMemoryDump::~ProcessMemoryDump() {}
 
 MemoryAllocatorDump* ProcessMemoryDump::CreateAllocatorDump(
     const std::string& absolute_name) {
   return AddAllocatorDumpInternal(
       make_scoped_ptr(new MemoryAllocatorDump(absolute_name, this)));
 }
 
 MemoryAllocatorDump* ProcessMemoryDump::CreateAllocatorDump(
@@ skipping 150 matching lines @@
 
 void ProcessMemoryDump::AddSuballocation(const MemoryAllocatorDumpGuid& source,
                                          const std::string& target_node_name) {
   std::string child_mad_name = target_node_name + "/__" + source.ToString();
   MemoryAllocatorDump* target_child_mad = CreateAllocatorDump(child_mad_name);
   AddOwnershipEdge(source, target_child_mad->guid());
 }
 
 }  // namespace trace_event
 }  // namespace base