Fix 'except' and 'prefer' spelling.

chromeos/system/statistics_provider.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chromeos/system/statistics_provider.h"
 
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/files/file_path.h"
 #include "base/location.h"
@@ skipping 116 matching lines @@
  private:
   DISALLOW_COPY_AND_ASSIGN(StatisticsProviderImpl);
 };
 
 bool StatisticsProviderImpl::WaitForStatisticsLoaded() {
   CHECK(load_statistics_started_);
   if (on_statistics_loaded_.IsSignaled())
     return true;
 
   // Block if the statistics are not loaded yet. Normally this shouldn't
-  // happen excpet during OOBE.
+  // happen except during OOBE.
   base::Time start_time = base::Time::Now();
   base::ThreadRestrictions::ScopedAllowWait allow_wait;
   on_statistics_loaded_.TimedWait(base::TimeDelta::FromSeconds(kTimeoutSecs));
 
   base::TimeDelta dtime = base::Time::Now() - start_time;
   if (on_statistics_loaded_.IsSignaled()) {
     LOG(ERROR) << "Statistics loaded after waiting "
                << dtime.InMilliseconds() << "ms. ";
     return true;
   }
@@ skipping 175 matching lines @@
   return StatisticsProviderImpl::GetInstance();
 }
 
 // static
 void StatisticsProvider::SetTestProvider(StatisticsProvider* test_provider) {
   g_test_statistics_provider = test_provider;
 }
 
 }  // namespace system
 }  // namespace chromeos