Change other usages of .size() to .empty() when applicable.

remoting/base/tracer.cc

 // Copyright (c) 2010 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 "remoting/base/tracer.h"
 
 #include <list>
 
 #include "base/basictypes.h"
 #include "base/lazy_instance.h"
@@ skipping 58 matching lines @@
 
   void PrintLogs() {
     while(!stopped_) {
       TraceBuffer* buffer = NULL;
       {
         base::AutoLock l(lock_);
         if (buffers_.empty()) {
           wake_.Wait();
         }
         // Check again since we might have woken for a stop signal.
-        if (buffers_.size() != 0) {
+        if (!buffers_.empty()) {
           buffer = buffers_.back();
           buffers_.pop_back();
         }
       }
 
       if (buffer) {
         LogOneTrace(buffer);
         delete buffer;
       }
     }
@@ skipping 93 matching lines @@
 }
 
 void TraceContext::PopTracerInternal() { tracers_.pop_back(); }
 
 Tracer* TraceContext::GetTracerInternal() { return tracers_.back(); }
 
 
 }  // namespace remoting
 
 DISABLE_RUNNABLE_METHOD_REFCOUNT(remoting::OutputLogger);