Remove a few unnecssary scopers from unit tests.

TestWithIsolate and TestWithContext already instantiate the scopers.

BUG=none

Review-Url: https://codereview.chromium.org/2690303009
Cr-Commit-Position: refs/heads/master@{#43268}

test/unittests/api/isolate-unittest.cc

@@ -44,8 +44,6 @@ class MemoryPressureTask : public v8::Task {
 // Check that triggering a memory pressure notification on the isolate thread
 // doesn't request a GC interrupt.
 TEST_F(IsolateTest, MemoryPressureNotificationForeground) {
-  Isolate::Scope isolate_scope(isolate());
-
   internal::Isolate* i_isolate =
       reinterpret_cast<internal::Isolate*>(isolate());
 
@@ -57,8 +55,6 @@ TEST_F(IsolateTest, MemoryPressureNotificationForeground) {
 // Check that triggering a memory pressure notification on an background thread
 // requests a GC interrupt.
 TEST_F(IsolateTest, MemoryPressureNotificationBackground) {
-  Isolate::Scope isolate_scope(isolate());
-
   internal::Isolate* i_isolate =
       reinterpret_cast<internal::Isolate*>(isolate());
 

test/unittests/api/v8-object-unittest.cc

@@ -15,8 +15,6 @@ void accessor_name_getter_callback(Local<Name>,
                                    const PropertyCallbackInfo<Value>&) {}
 
 TEST_F(ObjectTest, SetAccessorWhenUnconfigurablePropAlreadyDefined) {
-  Context::Scope context_scope(context());
-
   TryCatch try_catch(isolate());
 
   Local<Object> global = context()->Global();