LevelDBDatabase::Compact compacts db (on disk) w/o requiring reopen.

content/browser/indexed_db/indexed_db_browsertest.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/bind.h"
 #include "base/command_line.h"
 #include "base/file_util.h"
 #include "base/files/file.h"
 #include "base/files/file_enumerator.h"
 #include "base/files/file_path.h"
@@ skipping 623 matching lines @@
   // deleting reduces the amount stored.
 
   // The below tests make assumptions about implementation specifics, such as
   // data compression, compaction efficiency, and the maximum amount of
   // metadata and log data remains after a deletion. It is possible that
   // changes to the implementation may require these constants to be tweaked.
 
   const int kTestFillBytes = 1024 * 1024 * 5;  // 5MB
   EXPECT_GT(after_filling, kTestFillBytes);
 
-  const int kTestCompactBytes = 1024 * 1024 * 1;  // 1MB
+  const int kTestCompactBytes = 1024 * 10;  // 10kB
   EXPECT_LT(after_deleting, kTestCompactBytes);
 }
 
 // Complex multi-step (converted from pyauto) tests begin here.
 
 // Verify null key path persists after restarting browser.
 IN_PROC_BROWSER_TEST_F(IndexedDBBrowserTest, PRE_NullKeyPathPersistence) {
   NavigateAndWaitForTitle(shell(), "bug_90635.html", "#part1",
                           "pass - first run");
 }
@@ skipping 78 matching lines @@
 #define MAYBE_RenderThreadShutdownTest DISABLED_RenderThreadShutdownTest
 #else
 #define MAYBE_RenderThreadShutdownTest RenderThreadShutdownTest
 #endif
 IN_PROC_BROWSER_TEST_F(IndexedDBBrowserTestSingleProcess,
                        MAYBE_RenderThreadShutdownTest) {
   SimpleTest(GetTestUrl("indexeddb", "shutdown_with_requests.html"));
 }
 
 }  // namespace content