[cleanup] Fix deprecated function use in generated bindings

Use Maybe version of BooleanValue fallback for generated bindings.

Bug: v8:7786
Change-Id: I8cc17d532840caca2354d6a89be5abe952e47c4a
Reviewed-on: https://chromium-review.googlesource.com/1160201Reviewed-by: Yuki Shiino <yukishiino@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Dan Elphick <delphick@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580137}

third_party/blink/renderer/bindings/templates/union_container.cpp.tmpl

@@ -192,7 +192,7 @@ void {{v8_class}}::ToImpl(v8::Isolate* isolate, v8::Local<v8::Value> v8Value, {{
   {# 16. Boolean (fallback) #}
   {% elif boolean_type %}
   {
-    impl.SetBoolean(v8Value->BooleanValue());
+    impl.SetBoolean(v8Value->BooleanValue(isolate->GetCurrentContext()).ToChecked());
     return;
   }
 

third_party/blink/renderer/bindings/tests/results/core/boolean_or_element_sequence.cc

@@ -89,7 +89,7 @@ void V8BooleanOrElementSequence::ToImpl(v8::Isolate* isolate, v8::Local<v8::Valu
   }
 
   {
-    impl.SetBoolean(v8Value->BooleanValue());
+    impl.SetBoolean(v8Value->BooleanValue(isolate->GetCurrentContext()).ToChecked());
     return;
   }
 }

third_party/blink/renderer/bindings/tests/results/core/boolean_or_test_callback_interface.cc

@@ -81,7 +81,7 @@ void V8BooleanOrTestCallbackInterface::ToImpl(v8::Isolate* isolate, v8::Local<v8
   }
 
   {
-    impl.SetBoolean(v8Value->BooleanValue());
+    impl.SetBoolean(v8Value->BooleanValue(isolate->GetCurrentContext()).ToChecked());
     return;
   }
 }