Use movable types for CallStackProfile(s) to remove copying of data.

components/metrics/call_stack_profile_collector.h

 // Copyright 2016 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 COMPONENTS_METRICS_CALL_STACK_PROFILE_COLLECTOR_H_
 #define COMPONENTS_METRICS_CALL_STACK_PROFILE_COLLECTOR_H_
 
 #include "base/macros.h"
 #include "components/metrics/public/interfaces/call_stack_profile_collector.mojom.h"
 
 namespace metrics {
 
 class CallStackProfileCollector : public mojom::CallStackProfileCollector {
  public:
   using CallStackProfile = base::StackSamplingProfiler::CallStackProfile;
 
   explicit CallStackProfileCollector(
       CallStackProfileParams::Process expected_process);
   ~CallStackProfileCollector() override;
 
   // Create a collector to receive profiles from |expected_process|.
   static void Create(CallStackProfileParams::Process expected_process,
                      mojom::CallStackProfileCollectorRequest request);
 
   // mojom::CallStackProfileCollector:
   void Collect(const CallStackProfileParams& params,
                base::TimeTicks start_timestamp,
-               const std::vector<CallStackProfile>& profiles) override;
+               std::vector<CallStackProfile> profiles) override;
 
  private:
   // Profile params are validated to come from this process. Profiles with a
   // different process declared in the params are considered untrustworthy and
   // ignored.
   const CallStackProfileParams::Process expected_process_;
 
   DISALLOW_COPY_AND_ASSIGN(CallStackProfileCollector);
 };
 
 }  // namespace metrics
 
 #endif  // COMPONENTS_METRICS_CALL_STACK_PROFILE_COLLECTOR_H_