base: Remove some unnecessary const scoped_refptr<>&.

base/trace_event/process_memory_dump.cc

Index: base/trace_event/process_memory_dump.cc
diff --git a/base/trace_event/process_memory_dump.cc b/base/trace_event/process_memory_dump.cc
index 2fbe531d551ab64cd1035c7b0c3ab7aeb9351f98..9cc2168ea601bc7f16acb4fd4e22aa4ff4050c5d 100644
--- a/base/trace_event/process_memory_dump.cc
+++ b/base/trace_event/process_memory_dump.cc
@@ -121,10 +121,10 @@ size_t ProcessMemoryDump::CountResidentBytes(void* start_address,
 #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() {}