Revert of Fix memory leak in ThreadWatcher.

chrome/browser/metrics/thread_watcher_unittest.cc

Index: chrome/browser/metrics/thread_watcher_unittest.cc
diff --git a/chrome/browser/metrics/thread_watcher_unittest.cc b/chrome/browser/metrics/thread_watcher_unittest.cc
index c5ee92364f3964958e2518e85487ad793c7aca44..4aca262b664fda495d657724d99aeec98ba7856d 100644
--- a/chrome/browser/metrics/thread_watcher_unittest.cc
+++ b/chrome/browser/metrics/thread_watcher_unittest.cc
@@ -279,19 +279,13 @@
     thread_watcher_list_ = new ThreadWatcherList();
 
     // Create thread watcher object for the IO thread.
-    std::unique_ptr<CustomThreadWatcher> io_watcher(
-        new CustomThreadWatcher(BrowserThread::IO, kIOThreadName,
-                                kSleepTime, kUnresponsiveTime));
-    io_watcher_ = io_watcher.get();
-    ASSERT_TRUE(ThreadWatcherList::Register(std::move(io_watcher)));
+    io_watcher_ = new CustomThreadWatcher(BrowserThread::IO, kIOThreadName,
+                                          kSleepTime, kUnresponsiveTime);
     EXPECT_EQ(io_watcher_, thread_watcher_list_->Find(BrowserThread::IO));
 
     // Create thread watcher object for the DB thread.
-    std::unique_ptr<CustomThreadWatcher> db_watcher(
-        new CustomThreadWatcher(BrowserThread::DB, kDBThreadName,
-                                kSleepTime, kUnresponsiveTime));
-    db_watcher_ = db_watcher.get();
-    ASSERT_TRUE(ThreadWatcherList::Register(std::move(db_watcher)));
+    db_watcher_ = new CustomThreadWatcher(BrowserThread::DB, kDBThreadName,
+                                          kSleepTime, kUnresponsiveTime);
     EXPECT_EQ(db_watcher_, thread_watcher_list_->Find(BrowserThread::DB));
 
     {