Update legacy Tuple-using code.

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 b3e2fac0a6eedbbaa75ba8363adc874371dcb555..e60586ca14a4f626283d76b997c2bd6584f61131 100644
--- a/content/common/gpu/gpu_channel.cc
+++ b/content/common/gpu/gpu_channel.cc
@@ -111,7 +111,7 @@ class GpuChannelMessageFilter : public IPC::MessageFilter {
     }
 
     if (message.type() == GpuCommandBufferMsg_InsertSyncPoint::ID) {
-      Tuple1<bool> retire;
+      Tuple<bool> retire;
       IPC::Message* reply = IPC::SyncMessage::GenerateReply(&message);
       if (!GpuCommandBufferMsg_InsertSyncPoint::ReadSendParam(&message,
                                                               &retire)) {
@@ -119,7 +119,7 @@ class GpuChannelMessageFilter : public IPC::MessageFilter {
         Send(reply);
         return true;
       }
-      if (!future_sync_points_ && !retire.a) {
+      if (!future_sync_points_ && !get<0>(retire)) {
         LOG(ERROR) << "Untrusted contexts can't create future sync points";
         reply->set_reply_error();
         Send(reply);
@@ -134,7 +134,7 @@ class GpuChannelMessageFilter : public IPC::MessageFilter {
                      gpu_channel_,
                      sync_point_manager_,
                      message.routing_id(),
-                     retire.a,
+                     get<0>(retire),
                      sync_point));
       handled = true;
     }