Make it clear what last_sync_timestamp actually tracks. Update

chrome/browser/sync/notifier/base/linux/async_network_alive_linux.cc

Index: chrome/browser/sync/notifier/base/linux/async_network_alive_linux.cc
diff --git a/chrome/browser/sync/notifier/base/linux/async_network_alive_linux.cc b/chrome/browser/sync/notifier/base/linux/async_network_alive_linux.cc
index 28e89a9d7f80de8e9bc1cc29c62288b7eface9b1..9c096dad44e4dafab9349eb76289bb0c525648cd 100644
--- a/chrome/browser/sync/notifier/base/linux/async_network_alive_linux.cc
+++ b/chrome/browser/sync/notifier/base/linux/async_network_alive_linux.cc
@@ -69,7 +69,7 @@ class AsyncNetworkAliveLinux : public AsyncNetworkAlive {
       return;
     }
 
-    // Since we recieved a change from the socket, read the change in.
+    // Since we received a change from the socket, read the change in.
     if (FD_ISSET(fd, &rdfs)) {
       char buf[4096];
       struct iovec iov = { buf, sizeof(buf) };