Move FilePathWatcher to base/files.

chrome/browser/policy/file_based_policy_loader.cc

Index: chrome/browser/policy/file_based_policy_loader.cc
diff --git a/chrome/browser/policy/file_based_policy_loader.cc b/chrome/browser/policy/file_based_policy_loader.cc
index a127a71cf43edd954de4bf099c95bd20e90b6470..df8c204a765f94354f922a7fa39291426d9ffac2 100644
--- a/chrome/browser/policy/file_based_policy_loader.cc
+++ b/chrome/browser/policy/file_based_policy_loader.cc
@@ -32,7 +32,8 @@ FileBasedPolicyLoader::FileBasedPolicyLoader(
 
 FileBasedPolicyLoader::~FileBasedPolicyLoader() {}
 
-class FileBasedPolicyWatcherDelegate : public FilePathWatcher::Delegate {
+class FileBasedPolicyWatcherDelegate
+    : public base::files::FilePathWatcher::Delegate {
  public:
   explicit FileBasedPolicyWatcherDelegate(
       scoped_refptr<FileBasedPolicyLoader> loader)
@@ -94,7 +95,7 @@ void FileBasedPolicyLoader::Reload() {
 
 void FileBasedPolicyLoader::InitOnFileThread() {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::FILE));
-  watcher_.reset(new FilePathWatcher);
+  watcher_.reset(new base::files::FilePathWatcher);
   const FilePath& path = config_file_path();
   if (!path.empty() &&
       !watcher_->Watch(path, new FileBasedPolicyWatcherDelegate(this))) {