Revert of DatabaseBackend should not post a task to an already terminated database thread

Source/modules/webdatabase/DatabaseContext.cpp

Index: Source/modules/webdatabase/DatabaseContext.cpp
diff --git a/Source/modules/webdatabase/DatabaseContext.cpp b/Source/modules/webdatabase/DatabaseContext.cpp
index b47426087f34c3de5eac6b5fb202ab6bcdc0cca9..456087abd8cf1966d3cf3df6aa1164b1affae824 100644
--- a/Source/modules/webdatabase/DatabaseContext.cpp
+++ b/Source/modules/webdatabase/DatabaseContext.cpp
@@ -165,11 +165,6 @@
     return m_databaseThread.get();
 }
 
-bool DatabaseContext::databaseThreadAvailable()
-{
-    return m_databaseThread && !m_hasRequestedTermination;
-}
-
 void DatabaseContext::stopDatabases()
 {
     // Though we initiate termination of the DatabaseThread here in
@@ -182,7 +177,7 @@
     // m_databaseThread RefPtr destructor will deref and delete the
     // DatabaseThread.
 
-    if (databaseThreadAvailable()) {
+    if (m_databaseThread && !m_hasRequestedTermination) {
         TaskSynchronizer sync;
         m_databaseThread->requestTermination(&sync);
         m_hasRequestedTermination = true;