libchrome: Several upstreamable fixes from libchrome

base/message_loop/message_pump_libevent.cc

Index: base/message_loop/message_pump_libevent.cc
diff --git a/base/message_loop/message_pump_libevent.cc b/base/message_loop/message_pump_libevent.cc
index fef01da9a657820672e56fd2daa6c3d6b17806c9..ccfb3761f30cf9ae60cef11b86b68f266a40b9ce 100644
--- a/base/message_loop/message_pump_libevent.cc
+++ b/base/message_loop/message_pump_libevent.cc
@@ -87,7 +87,8 @@ event *MessagePumpLibevent::FileDescriptorWatcher::ReleaseEvent() {
 }
 
 void MessagePumpLibevent::FileDescriptorWatcher::OnFileCanReadWithoutBlocking(
-    int fd, MessagePumpLibevent* pump) {
+    int fd,
+    MessagePumpLibevent*) {
   // Since OnFileCanWriteWithoutBlocking() gets called first, it can stop
   // watching the file descriptor.
   if (!watcher_)
@@ -96,7 +97,8 @@ void MessagePumpLibevent::FileDescriptorWatcher::OnFileCanReadWithoutBlocking(
 }
 
 void MessagePumpLibevent::FileDescriptorWatcher::OnFileCanWriteWithoutBlocking(
-    int fd, MessagePumpLibevent* pump) {
+    int fd,
+    MessagePumpLibevent*) {
   DCHECK(watcher_);
   watcher_->OnFileCanWriteWithoutBlocking(fd);
 }
@@ -195,8 +197,7 @@ bool MessagePumpLibevent::WatchFileDescriptor(int fd,
 }
 
 // Tell libevent to break out of inner loop.
-static void timer_callback(int fd, short events, void *context)
-{
+static void timer_callback(int /*fd*/, short /*events*/, void* context) {
   event_base_loopbreak((struct event_base *)context);
 }
 
@@ -347,7 +348,7 @@ void MessagePumpLibevent::OnLibeventNotification(int fd,
 
 // Called if a byte is received on the wakeup pipe.
 // static
-void MessagePumpLibevent::OnWakeup(int socket, short flags, void* context) {
+void MessagePumpLibevent::OnWakeup(int socket, short /*flags*/, void* context) {
   MessagePumpLibevent* that = static_cast<MessagePumpLibevent*>(context);
   DCHECK(that->wakeup_pipe_out_ == socket);