Remove labels_node_list.h dependency from html_element.h

This CL reduces the estimated pre-processed size of html_element.h
by 2.53MB.
This CL has no behavior changes.

Bug: 242216
Change-Id: Icb9861dcbc28599e8cd6d5bfe657dde4329db70f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2281771
Commit-Queue: Kent Tamura <tkent@chromium.org>
Commit-Queue: Takuto Ikuta <tikuta@chromium.org>
Auto-Submit: Kent Tamura <tkent@chromium.org>
Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
Cr-Commit-Position: refs/heads/master@{#785288}

third_party/blink/renderer/core/html/forms/submit_input_type.cc

@@ -32,6 +32,7 @@
 #include "third_party/blink/renderer/core/html/forms/submit_input_type.h"
 
 #include "third_party/blink/public/strings/grit/blink_strings.h"
+#include "third_party/blink/renderer/core/dom/document.h"
 #include "third_party/blink/renderer/core/dom/events/event.h"
 #include "third_party/blink/renderer/core/frame/web_feature.h"
 #include "third_party/blink/renderer/core/html/forms/form_data.h"

third_party/blink/renderer/core/html/html_element.h

@@ -25,7 +25,6 @@
 
 #include "third_party/blink/renderer/core/core_export.h"
 #include "third_party/blink/renderer/core/dom/element.h"
-#include "third_party/blink/renderer/core/html/forms/labels_node_list.h"
 #include "third_party/blink/renderer/platform/text/text_direction.h"
 #include "third_party/blink/renderer/platform/wtf/casting.h"
 
@@ -39,6 +38,7 @@ class ExceptionState;
 class FormAssociated;
 class HTMLFormElement;
 class KeyboardEvent;
+class LabelsNodeList;
 class StringOrTrustedScript;
 class StringTreatNullAsEmptyStringOrTrustedScript;
 

third_party/blink/renderer/core/mathml/mathml_element.cc

@@ -8,6 +8,7 @@
 #include "third_party/blink/renderer/core/css/css_property_name.h"
 #include "third_party/blink/renderer/core/css/parser/css_parser.h"
 #include "third_party/blink/renderer/core/css_value_keywords.h"
+#include "third_party/blink/renderer/core/dom/document.h"
 #include "third_party/blink/renderer/core/html/html_element.h"
 
 namespace blink {

third_party/blink/renderer/modules/xr/xr_system.h

@@ -7,6 +7,7 @@
 
 #include "device/vr/public/mojom/vr_service.mojom-blink.h"
 #include "mojo/public/cpp/bindings/pending_receiver.h"
+#include "third_party/blink/public/mojom/devtools/console_message.mojom-blink.h"
 #include "third_party/blink/renderer/bindings/core/v8/script_promise.h"
 #include "third_party/blink/renderer/bindings/modules/v8/v8_xr_dom_overlay_init.h"
 #include "third_party/blink/renderer/bindings/modules/v8/v8_xr_session_init.h"