Move platform abstraction to base library

src/debug.cc

Index: src/debug.cc
diff --git a/src/debug.cc b/src/debug.cc
index d99e6f54970accfd5b05e1aaea2afe3b10f42e68..6f3e4bc5e616ecd6b14369ba2dffcb3e2f53aa88 100644
--- a/src/debug.cc
+++ b/src/debug.cc
@@ -3325,13 +3325,13 @@ LockingCommandMessageQueue::LockingCommandMessageQueue(Logger* logger, int size)
 
 
 bool LockingCommandMessageQueue::IsEmpty() const {
-  LockGuard<Mutex> lock_guard(&mutex_);
+  base::LockGuard<base::Mutex> lock_guard(&mutex_);
   return queue_.IsEmpty();
 }
 
 
 CommandMessage LockingCommandMessageQueue::Get() {
-  LockGuard<Mutex> lock_guard(&mutex_);
+  base::LockGuard<base::Mutex> lock_guard(&mutex_);
   CommandMessage result = queue_.Get();
   logger_->DebugEvent("Get", result.text());
   return result;
@@ -3339,14 +3339,14 @@ CommandMessage LockingCommandMessageQueue::Get() {
 
 
 void LockingCommandMessageQueue::Put(const CommandMessage& message) {
-  LockGuard<Mutex> lock_guard(&mutex_);
+  base::LockGuard<base::Mutex> lock_guard(&mutex_);
   queue_.Put(message);
   logger_->DebugEvent("Put", message.text());
 }
 
 
 void LockingCommandMessageQueue::Clear() {
-  LockGuard<Mutex> lock_guard(&mutex_);
+  base::LockGuard<base::Mutex> lock_guard(&mutex_);
   queue_.Clear();
 }