libchrome: Several upstreamable fixes from libchrome

base/trace_event/trace_log.cc

Index: base/trace_event/trace_log.cc
diff --git a/base/trace_event/trace_log.cc b/base/trace_event/trace_log.cc
index cc40ba98eb31f5c0b5e370bacbf8ca5b232a15dd..1da42bfa56b463869647cea09c776db786f382af 100644
--- a/base/trace_event/trace_log.cc
+++ b/base/trace_event/trace_log.cc
@@ -308,7 +308,7 @@ void TraceLog::ThreadLocalEventBuffer::WillDestroyCurrentMessageLoop() {
   delete this;
 }
 
-bool TraceLog::ThreadLocalEventBuffer::OnMemoryDump(const MemoryDumpArgs& args,
+bool TraceLog::ThreadLocalEventBuffer::OnMemoryDump(const MemoryDumpArgs&,
                                                     ProcessMemoryDump* pmd) {
   if (!chunk_)
     return true;
@@ -414,8 +414,7 @@ void TraceLog::InitializeThreadLocalEventBufferIfSupported() {
   }
 }
 
-bool TraceLog::OnMemoryDump(const MemoryDumpArgs& args,
-                            ProcessMemoryDump* pmd) {
+bool TraceLog::OnMemoryDump(const MemoryDumpArgs&, ProcessMemoryDump* pmd) {
   // TODO(ssid): Use MemoryDumpArgs to create light dumps when requested
   // (crbug.com/499731).
   TraceEventMemoryOverhead overhead;