base: Remove some unnecessary const scoped_refptr<>&.

base/trace_event/process_memory_dump.h

 // 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.
 
 #ifndef BASE_TRACE_EVENT_PROCESS_MEMORY_DUMP_H_
 #define BASE_TRACE_EVENT_PROCESS_MEMORY_DUMP_H_
 
 #include <stddef.h>
 
 #include <unordered_map>
@@ skipping 45 matching lines @@
   using HeapDumpsMap = std::unordered_map<std::string, scoped_ptr<TracedValue>>;
 
 #if defined(COUNT_RESIDENT_BYTES_SUPPORTED)
   // Returns the total bytes resident for a virtual address range, with given
   // |start_address| and |mapped_size|. |mapped_size| is specified in bytes. The
   // value returned is valid only if the given range is currently mmapped by the
   // process. The |start_address| must be page-aligned.
   static size_t CountResidentBytes(void* start_address, size_t mapped_size);
 #endif
 
-  ProcessMemoryDump(const scoped_refptr<MemoryDumpSessionState>& session_state);
+  ProcessMemoryDump(scoped_refptr<MemoryDumpSessionState> session_state);
   ~ProcessMemoryDump();
 
   // Creates a new MemoryAllocatorDump with the given name and returns the
   // empty object back to the caller.
   // Arguments:
   //   absolute_name: a name that uniquely identifies allocator dumps produced
   //       by this provider. It is possible to specify nesting by using a
   //       path-like string (e.g., v8/isolate1/heap1, v8/isolate1/heap2).
   //       Leading or trailing slashes are not allowed.
   //   guid: an optional identifier, unique among all processes within the
@@ skipping 112 matching lines @@
   // Keeps track of relationships between MemoryAllocatorDump(s).
   std::vector<MemoryAllocatorDumpEdge> allocator_dumps_edges_;
 
   DISALLOW_COPY_AND_ASSIGN(ProcessMemoryDump);
 };
 
 }  // namespace trace_event
 }  // namespace base
 
 #endif  // BASE_TRACE_EVENT_PROCESS_MEMORY_DUMP_H_