[IndexedDB]: Shipping IDBFactory databases()

Removing flag and adding method to virtual/stable/ expected.txt files
for shipping IDBFactory.databases() (IndexedDB database info enumeration
function).

Intent to Ship: https://groups.google.com/a/chromium.org/d/msg/blink-dev/xSf7B0aVxnI/0E05ZEB6DAAJ

Change-Id: Idb3253ed11368f3cc0353756409a0f49c9e61426
Reviewed-on: https://chromium-review.googlesource.com/c/1318536Reviewed-by: Daniel Murphy <dmurph@chromium.org>
Reviewed-by: Kent Tamura <tkent@chromium.org>
Commit-Queue: Andreas Butler <andreasbutler@google.com>
Cr-Commit-Position: refs/heads/master@{#605571}

third_party/WebKit/LayoutTests/virtual/stable/http/tests/serviceworker/webexposed/global-interface-listing-service-worker-expected.txt

@@ -501,6 +501,7 @@ interface IDBFactory
     attribute @@toStringTag
     method cmp
     method constructor
+    method databases
     method deleteDatabase
     method open
 interface IDBIndex

third_party/WebKit/LayoutTests/virtual/stable/webexposed/global-interface-listing-dedicated-worker-expected.txt

@@ -472,6 +472,7 @@ Starting worker: resources/global-interface-listing-worker.js
 [Worker]     attribute @@toStringTag
 [Worker]     method cmp
 [Worker]     method constructor
+[Worker]     method databases
 [Worker]     method deleteDatabase
 [Worker]     method open
 [Worker] interface IDBIndex

third_party/WebKit/LayoutTests/virtual/stable/webexposed/global-interface-listing-expected.txt

@@ -3394,6 +3394,7 @@ interface IDBFactory
     attribute @@toStringTag
     method cmp
     method constructor
+    method databases
     method deleteDatabase
     method open
 interface IDBIndex

third_party/WebKit/LayoutTests/virtual/stable/webexposed/global-interface-listing-shared-worker-expected.txt

@@ -467,6 +467,7 @@ Starting worker: resources/global-interface-listing-worker.js
 [Worker]     attribute @@toStringTag
 [Worker]     method cmp
 [Worker]     method constructor
+[Worker]     method databases
 [Worker]     method deleteDatabase
 [Worker]     method open
 [Worker] interface IDBIndex

third_party/blink/renderer/modules/indexeddb/idb_factory.idl

@@ -40,8 +40,7 @@
     [
       CallWith=ScriptState,
       ImplementedAs=GetDatabaseInfo,
-      RaisesException,
-      RuntimeEnabled=IDBGetDatabases
+      RaisesException
     ] Promise<sequence<IDBDatabaseInfo>> databases();
 };
 

third_party/blink/renderer/platform/runtime_enabled_features.json5

@@ -588,10 +588,6 @@
       name: "HTMLImportsStyleApplication",
       status: "stable",
     },
-    {
-      name: "IDBGetDatabases",
-      status: "experimental",
-    },
     {
       name: "IDBObserver",
       status: "experimental",