Refactoring: Make IPC::Channel::TakeClientFileDescriptor() a ScopedFD.

content/common/gpu/gpu_channel.cc

Index: content/common/gpu/gpu_channel.cc
diff --git a/content/common/gpu/gpu_channel.cc b/content/common/gpu/gpu_channel.cc
index 4290bf91fbe93ffe7c408884bde7d9d6a4f86a2b..817751dea25d0c337810f52c9559d213ccf89b36 100644
--- a/content/common/gpu/gpu_channel.cc
+++ b/content/common/gpu/gpu_channel.cc
@@ -456,10 +456,10 @@ std::string GpuChannel::GetChannelName() {
 }
 
 #if defined(OS_POSIX)
-int GpuChannel::TakeRendererFileDescriptor() {
+base::ScopedFD GpuChannel::TakeRendererFileDescriptor() {
   if (!channel_) {
     NOTREACHED();
-    return -1;
+    return base::ScopedFD();
   }
   return channel_->TakeClientFileDescriptor();
 }