Move IndexedDB from WEBKIT_DEPRECATED to dedicated thread

content/browser/browser_main_loop.cc

Index: content/browser/browser_main_loop.cc
diff --git a/content/browser/browser_main_loop.cc b/content/browser/browser_main_loop.cc
index f16ea4fd96141af801580c68fd9b22927eb824a2..98ef6b21557854fa9ea33d806b3e40a1395cca81 100644
--- a/content/browser/browser_main_loop.cc
+++ b/content/browser/browser_main_loop.cc
@@ -601,6 +601,11 @@ void BrowserMainLoop::CreateThreads() {
 
   }
 
+#if !defined(OS_IOS)
+  indexed_db_thread_.reset(new base::Thread("IndexedDB"));
+  indexed_db_thread_->Start();
+#endif
+
   BrowserThreadsStarted();
 
   if (parts_) {
@@ -749,6 +754,10 @@ void BrowserMainLoop::ShutdownThreadsAndCleanUp() {
     }
   }
 
+#if !defined(OS_IOS)
+  indexed_db_thread_.reset();
+#endif
+
   // Close the blocking I/O pool after the other threads. Other threads such
   // as the I/O thread may need to schedule work like closing files or flushing
   // data during shutdown, so the blocking pool needs to be available. There