Revert "Migrate the IndexedDB backend from Blink to Chromium"

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 222a71bbee074a2d60e55728fdee123e33870f81..53131ce0664bfdc65bbce1cd44481d4b9d9a7bfe 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -559,10 +559,6 @@ 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"