Fix GCC build

Change-Id: I3df0bc0bb9d711dae49293f130931dbdb66877cf
diff --git a/tools/trace_to_text/main.cc b/tools/trace_to_text/main.cc
index 2950bb2..5e7390e 100644
--- a/tools/trace_to_text/main.cc
+++ b/tools/trace_to_text/main.cc
@@ -196,7 +196,7 @@
   std::vector<const char*> meminfo_strs = BuildMeminfoCounterNames();
   std::vector<const char*> vmstat_strs = BuildVmstatCounterNames();
 
-  std::vector<const protos::TracePacket> packets_to_process;
+  std::vector<protos::TracePacket> packets_to_process;
 
   ForEachPacketInTrace(
       input, [&thread_map, &packets_to_process, &proc_dump,