base: Update the include paths of base/string_piece.h to its new location.

base/metrics/stats_table_unittest.cc

 // Copyright (c) 2012 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 "base/metrics/stats_counters.h"
 #include "base/metrics/stats_table.h"
 #include "base/shared_memory.h"
 #include "base/stringprintf.h"
-#include "base/string_piece.h"
+#include "base/strings/string_piece.h"
 #include "base/test/multiprocess_test.h"
 #include "base/threading/platform_thread.h"
 #include "base/threading/simple_thread.h"
 #include "base/utf_string_conversions.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "testing/multiprocess_func_list.h"
 
 namespace base {
 
 class StatsTableTest : public MultiProcessTest {
@@ skipping 394 matching lines @@
     PlatformThread::Sleep(kDuration);
   }
   EXPECT_LE(kDuration.InMilliseconds() * 2, table.GetCounterValue("t:foo"));
   EXPECT_LE(kDuration.InMilliseconds() * 2, table.GetCounterValue("t:bar"));
   EXPECT_EQ(2, table.GetCounterValue("c:bar"));
 
   DeleteShmem(kTableName);
 }
 
 }  // namespace base