Fix for unused-lambda-capture warning

This CL is part of
https://chromium-review.googlesource.com/c/chromium/src/+/1286017

This CL was uploaded by git cl split.

R=oysteine@chromium.org

Bug: 681136
Change-Id: Ide55f05c47a2572da354617a83c9b6727633f61f
Reviewed-on: https://chromium-review.googlesource.com/c/1288495Reviewed-by: oysteine <oysteine@chromium.org>
Commit-Queue: Takuto Ikuta <tikuta@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600983}

services/tracing/coordinator.cc

@@ -482,7 +482,7 @@ void Coordinator::OnFlushDone() {
   std::move(stop_and_flush_callback_)
       .Run(std::move(*trace_streamer_->GetMetadata()));
   background_task_runner_->DeleteSoon(FROM_HERE, trace_streamer_.release());
-  agent_registry_->ForAllAgents([this](AgentRegistry::AgentEntry* agent_entry) {
+  agent_registry_->ForAllAgents([](AgentRegistry::AgentEntry* agent_entry) {
     agent_entry->set_is_tracing(false);
   });
   is_tracing_ = false;