Revert of [Bindings] Create and use V8 context snapshots

third_party/WebKit/Source/core/workers/WorkerBackingThread.cpp

Index: third_party/WebKit/Source/core/workers/WorkerBackingThread.cpp
diff --git a/third_party/WebKit/Source/core/workers/WorkerBackingThread.cpp b/third_party/WebKit/Source/core/workers/WorkerBackingThread.cpp
index aa749891b753798c306498d68661fac0caa60bde..a632bb795150d13093836fd1e1ec0a6d2561a610 100644
--- a/third_party/WebKit/Source/core/workers/WorkerBackingThread.cpp
+++ b/third_party/WebKit/Source/core/workers/WorkerBackingThread.cpp
@@ -6,7 +6,6 @@
 
 #include <memory>
 #include "bindings/core/v8/V8BindingForCore.h"
-#include "bindings/core/v8/V8ContextSnapshot.h"
 #include "bindings/core/v8/V8GCController.h"
 #include "bindings/core/v8/V8IdleTaskRunner.h"
 #include "bindings/core/v8/V8Initializer.h"
@@ -65,12 +64,8 @@
   backing_thread_->InitializeOnThread();
 
   DCHECK(!isolate_);
-  // TODO(peria): Replace GetReferenceTable with nullptr.
-  // (http://crbug.com/v8/6448)
   isolate_ = V8PerIsolateData::Initialize(
-      backing_thread_->PlatformThread().GetWebTaskRunner(),
-      V8ContextSnapshot::GetReferenceTable(),
-      V8PerIsolateData::V8ContextSnapshotMode::kDontUseSnapshot);
+      backing_thread_->PlatformThread().GetWebTaskRunner());
   AddWorkerIsolate(isolate_);
   V8Initializer::InitializeWorker(isolate_);