Turn on the new IndexedDB backend.

content/public/common/content_switches.cc

Index: content/public/common/content_switches.cc
diff --git a/content/public/common/content_switches.cc b/content/public/common/content_switches.cc
index 8faa5d06678b0200f74b9e8c5c4f55678af34cee..f9ecbd2bed65165b8f8d81a16a3547e44b68639c 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -557,10 +557,6 @@ const char kNoSandbox[]                     = "no-sandbox";
 // finishes.
 const char kAllowNoSandboxJob[]             = "allow-no-sandbox-job";
 
-// Use the new IndexedDB backend implemented in Chromium. By default,
-// the old backend implemented in Blink is used.
-const char kNewIndexedDB[]                  = "new-indexeddb";
-
 // Specifies a command that should be used to launch the plugin process.  Useful
 // for running the plugin process through purify or quantify.  Ex:
 //   --plugin-launcher="path\to\purify /Run=yes"