[DevTools] Clear DatabaseClient's pointer to InspectorDatabaseAgent on detach.

Source/modules/webdatabase/DatabaseClient.cpp

Index: Source/modules/webdatabase/DatabaseClient.cpp
diff --git a/Source/modules/webdatabase/DatabaseClient.cpp b/Source/modules/webdatabase/DatabaseClient.cpp
index 529948c93feb051a485fb3504f0d7ca4d82bfdd4..1999abdf236ea55522174e4e90a8824e1c854225 100644
--- a/Source/modules/webdatabase/DatabaseClient.cpp
+++ b/Source/modules/webdatabase/DatabaseClient.cpp
@@ -70,7 +70,7 @@ void DatabaseClient::didOpenDatabase(Database* database, const String& domain, c
 
 void DatabaseClient::setInspectorAgent(InspectorDatabaseAgent* agent)
 {
-    ASSERT(!m_inspectorAgent);
+    // TODO(dgozman): we should not set agent twice, but it's happening in OOPIF case.
     m_inspectorAgent = agent;
 }