Linux/ChromeOS Chromium style checker cleanup, chrome/browser edition.

chrome/browser/metrics/thread_watcher.cc

Index: chrome/browser/metrics/thread_watcher.cc
===================================================================
--- chrome/browser/metrics/thread_watcher.cc	(revision 181040)
+++ chrome/browser/metrics/thread_watcher.cc	(working copy)
@@ -812,7 +812,7 @@
   // Alarm is called if the time expires after an Arm() without someone calling
   // Disarm(). When Alarm goes off, in release mode we get the crash dump
   // without crashing and in debug mode we break into the debugger.
-  virtual void Alarm() {
+  virtual void Alarm() OVERRIDE {
 #ifndef NDEBUG
     DCHECK(false);
 #else
@@ -836,7 +836,7 @@
 
   // Alarm is called if the time expires after an Arm() without someone calling
   // Disarm(). We crash the browser if this method is called.
-  virtual void Alarm() {
+  virtual void Alarm() OVERRIDE {
     CHECK(false);
   }