Store gin::IsolateHolder as a plain member of V8PerIsolateData.

third_party/WebKit/Source/bindings/core/v8/V8PerIsolateData.cpp

Index: third_party/WebKit/Source/bindings/core/v8/V8PerIsolateData.cpp
diff --git a/third_party/WebKit/Source/bindings/core/v8/V8PerIsolateData.cpp b/third_party/WebKit/Source/bindings/core/v8/V8PerIsolateData.cpp
index bca8f89e360b9637ed13b3d07b2491c3ea07ec99..f28a0b17f478f7d3cd3e8a7469fa6a9a6e832b80 100644
--- a/third_party/WebKit/Source/bindings/core/v8/V8PerIsolateData.cpp
+++ b/third_party/WebKit/Source/bindings/core/v8/V8PerIsolateData.cpp
@@ -54,11 +54,11 @@ static void microtasksCompletedCallback(v8::Isolate* isolate) {
 }
 
 V8PerIsolateData::V8PerIsolateData(WebTaskRunner* taskRunner)
-    : m_isolateHolder(WTF::makeUnique<gin::IsolateHolder>(
+    : m_isolateHolder(
           taskRunner ? taskRunner->toSingleThreadTaskRunner() : nullptr,
           gin::IsolateHolder::kSingleThread,
           isMainThread() ? gin::IsolateHolder::kDisallowAtomicsWait
-                         : gin::IsolateHolder::kAllowAtomicsWait)),
+                         : gin::IsolateHolder::kAllowAtomicsWait),
       m_stringCache(WTF::wrapUnique(new StringCache(isolate()))),
       m_hiddenValue(V8HiddenValue::create()),
       m_privateProperty(V8PrivateProperty::create()),
@@ -91,8 +91,7 @@ v8::Isolate* V8PerIsolateData::initialize(WebTaskRunner* taskRunner) {
 void V8PerIsolateData::enableIdleTasks(
     v8::Isolate* isolate,
     std::unique_ptr<gin::V8IdleTaskRunner> taskRunner) {
-  from(isolate)->m_isolateHolder->EnableIdleTasks(
-      std::unique_ptr<gin::V8IdleTaskRunner>(taskRunner.release()));
+  from(isolate)->m_isolateHolder.EnableIdleTasks(std::move(taskRunner));
 }
 
 v8::Persistent<v8::Value>& V8PerIsolateData::ensureLiveRoot() {