Fix auto raw pointer deduction on linux

gin/v8_platform.cc

 // Copyright 2014 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 "gin/public/v8_platform.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/sys_info.h"
 #include "base/task_scheduler/post_task.h"
@@ skipping 183 matching lines @@
 
 namespace {
 
 class EnabledStateObserverImpl final
     : public base::trace_event::TraceLog::EnabledStateObserver {
  public:
   EnabledStateObserverImpl() = default;
 
   void OnTraceLogEnabled() final {
     base::AutoLock lock(mutex_);
-    for (auto o : observers_) {
+    for (auto* o : observers_) {
       o->OnTraceEnabled();
     }
   }
 
   void OnTraceLogDisabled() final {
     base::AutoLock lock(mutex_);
-    for (auto o : observers_) {
+    for (auto* o : observers_) {
       o->OnTraceDisabled();
     }
   }
 
   void AddObserver(v8::Platform::TraceStateObserver* observer) {
     {
       base::AutoLock lock(mutex_);
       DCHECK(!observers_.count(observer));
       if (observers_.empty()) {
         base::trace_event::TraceLog::GetInstance()->AddEnabledStateObserver(
@@ skipping 32 matching lines @@
     v8::Platform::TraceStateObserver* observer) {
   g_trace_state_dispatcher.Get().AddObserver(observer);
 }
 
 void V8Platform::RemoveTraceStateObserver(
     v8::Platform::TraceStateObserver* observer) {
   g_trace_state_dispatcher.Get().RemoveObserver(observer);
 }
 
 }  // namespace gin