remove lock from implementation

at_exit.cc

@@ -59,7 +59,7 @@ void AtExitManager::RegisterTask(base::Closure task) {
     return;
   }
 
-  AutoLock lock(g_top_manager->lock_);
+  // AutoLock lock(g_top_manager->lock_);
   // DCHECK(!g_top_manager->processing_callbacks_);
   g_top_manager->stack_.push(std::move(task));
 }
@@ -76,7 +76,7 @@ void AtExitManager::ProcessCallbacksNow() {
   // handle it gracefully in release builds so we don't deadlock.
   base::stack<base::Closure> tasks;
   {
-    AutoLock lock(g_top_manager->lock_);
+    // AutoLock lock(g_top_manager->lock_);
     tasks.swap(g_top_manager->stack_);
     g_top_manager->processing_callbacks_ = true;
   }
@@ -96,7 +96,7 @@ void AtExitManager::ProcessCallbacksNow() {
 }
 
 void AtExitManager::DisableAllAtExitManagers() {
-  AutoLock lock(g_top_manager->lock_);
+  // AutoLock lock(g_top_manager->lock_);
   g_disable_managers = true;
 }
 

at_exit.h

@@ -9,7 +9,7 @@
 #include "base/callback.h"
 #include "base/containers/stack.h"
 #include "base/macros.h"
-#include "base/synchronization/lock.h"
+// #include "base/synchronization/lock.h"
 
 namespace base {
 
@@ -60,7 +60,7 @@ class BASE_EXPORT AtExitManager {
   explicit AtExitManager(bool shadow);
 
  private:
-  base::Lock lock_;
+  // base::Lock lock_;
   base::stack<base::Closure> stack_;
   bool processing_callbacks_;
   AtExitManager* next_manager_;  // Stack of managers to allow shadowing.

sequence_checker_impl.h

@@ -10,7 +10,7 @@
 #include "base/base_export.h"
 #include "base/compiler_specific.h"
 #include "base/macros.h"
-#include "base/synchronization/lock.h"
+// #include "base/synchronization/lock.h"
 
 namespace base {
 
@@ -37,7 +37,7 @@ class BASE_EXPORT SequenceCheckerImpl {
   class Core;
 
   // Guards all variables below.
-  mutable Lock lock_;
+  // mutable Lock lock_;
   mutable std::unique_ptr<Core> core_;
 
   DISALLOW_COPY_AND_ASSIGN(SequenceCheckerImpl);