Revert of Use v8::MicrotasksScope internally in V8RecursionScope. (patchset #6 id:100001 of https://codereview.chromium.org/1743763004/ )

Reason for revert:
This CL appears to be causing test failures on Linux ChromiumOS Tests (dbg)(1).

See:
https://build.chromium.org/p/chromium.chromiumos/builders/Linux%20ChromiumOS%20Tests%20%28dbg%29%281%29/builds/12424

Tests are failing with:
Fatal error in ../../v8/src/api.cc, line 166
Check failed: handle_scope_implementer->GetMicrotasksScopeDepth() || !handle_scope_implementer->DebugMicrotasksScopeDepthIsZero()

Original issue's description:
> Use v8::MicrotasksScope internally in V8RecursionScope.
>
> If this sticks we can just remove V8RecursionScope and WebScopedMicrotaskSuppression,
> along with other cleanups.
>
> Attempt #2. Previous one broke GinJavaBridgeValueConverterTest.TypedArrays.
>
> BUG=585949
>
> Committed: https://crrev.com/95a3bd544fe93629b209797d3251423f3d674463
> Cr-Commit-Position: refs/heads/master@{#380033}

TBR=jochen@chromium.org,adamk@chromium.org,dgozman@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=585949

Review URL: https://codereview.chromium.org/1777183002

Cr-Commit-Position: refs/heads/master@{#380356}

4 files changed, 2 insertions, 6 deletions

diff --git a/extensions/renderer/activity_log_converter_strategy_unittest.cc b/extensions/renderer/activity_log_converter_strategy_unittest.cc
index aa80447..9237cad 100644
--- a/extensions/renderer/activity_log_converter_strategy_unittest.cc
+++ b/extensions/renderer/activity_log_converter_strategy_unittest.cc
@@ -6,7 +6,6 @@
 #include "base/values.h"
 #include "extensions/renderer/activity_log_converter_strategy.h"
 #include "testing/gtest/include/gtest/gtest.h"
-#include "third_party/WebKit/public/web/WebScopedMicrotaskSuppression.h"
 #include "v8/include/v8.h"
 
 using content::V8ValueConverter;
@@ -123,7 +122,6 @@ TEST_F(ActivityLogConverterStrategyTest, ConversionTest) {
       "};"
       "})();";
 
-  blink::WebScopedMicrotaskSuppression microtasks_scope;
   v8::Local<v8::Script> script(
       v8::Script::Compile(v8::String::NewFromUtf8(isolate_, source)));
   v8::Local<v8::Object> v8_object = script->Run().As<v8::Object>();
diff --git a/extensions/renderer/api_test_base.cc b/extensions/renderer/api_test_base.cc
index 79f95e2..abf868b 100644
--- a/extensions/renderer/api_test_base.cc
+++ b/extensions/renderer/api_test_base.cc
@@ -214,7 +214,7 @@ void ApiTestEnvironment::RunTestInner(const std::string& test_name,
 }
 
 void ApiTestEnvironment::RunPromisesAgain() {
-  v8::MicrotasksScope::PerformCheckpoint(env()->isolate());
+  env()->isolate()->RunMicrotasks();
   base::MessageLoop::current()->PostTask(
       FROM_HERE, base::Bind(&ApiTestEnvironment::RunPromisesAgain,
                             base::Unretained(this)));
diff --git a/extensions/renderer/module_system_test.cc b/extensions/renderer/module_system_test.cc
index 06a4d55..68c4bd1 100644
--- a/extensions/renderer/module_system_test.cc
+++ b/extensions/renderer/module_system_test.cc
@@ -253,7 +253,7 @@ void ModuleSystemTest::ExpectNoAssertionsMade() {
 }
 
 void ModuleSystemTest::RunResolvedPromises() {
-  v8::MicrotasksScope::PerformCheckpoint(isolate_);
+  isolate_->RunMicrotasks();
 }
 
 }  // namespace extensions
diff --git a/extensions/renderer/safe_builtins.cc b/extensions/renderer/safe_builtins.cc
index 3a66eaf..3bfa01a 100644
--- a/extensions/renderer/safe_builtins.cc
+++ b/extensions/renderer/safe_builtins.cc
@@ -9,7 +9,6 @@
 #include "base/strings/stringprintf.h"
 #include "extensions/renderer/script_context.h"
 #include "extensions/renderer/v8_helpers.h"
-#include "third_party/WebKit/public/web/WebScopedMicrotaskSuppression.h"
 
 namespace extensions {
 
@@ -201,7 +200,6 @@ class ExtensionImpl : public v8::Extension {
         return;
     }
 
-    blink::WebScopedMicrotaskSuppression microtasks_scope;
     v8::Local<v8::Value> return_value;
     if (function->Call(context, recv, argc, argv.get()).ToLocal(&return_value))
       info.GetReturnValue().Set(return_value);