bind-gen: Make web feature implementations include necessary headers

Some of Blink implementations are missing header includes about
return types.  Adds missing header include directives.

Example)

  // IDL
  TypeA foo();

  // Implementation (.h)
  TypeB* foo();  // TypeB might inherit from TypeA, but who knows?

In this case, there is no way for bindings generator to include an
appropriate header "type_b.h" because foo's return type is known as
"TypeA".  Bindings generator includes "type_a.h", but it doesn't
help handle a return value of type TypeB.

Correct implementation is either of:

  TypeA* foo();

or,

  #include "type_b.h"
  TypeB* foo();  // TypeB is known to inherit from TypeA

Bug: 839389
Change-Id: I5092b46a8579a4406a5567f68f6d4266e29eaa72
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2051797Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Yuki Shiino <yukishiino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#740607}

third_party/blink/renderer/core/dom/container_node.h

@@ -29,6 +29,7 @@
 #include "third_party/blink/renderer/core/core_export.h"
 #include "third_party/blink/renderer/core/css/style_recalc.h"
 #include "third_party/blink/renderer/core/dom/node.h"
+#include "third_party/blink/renderer/core/dom/static_node_list.h"
 #include "third_party/blink/renderer/core/html/collection_type.h"
 #include "third_party/blink/renderer/platform/wtf/casting.h"
 #include "third_party/blink/renderer/platform/wtf/vector.h"
@@ -36,16 +37,15 @@
 namespace blink {
 
 class ClassCollection;
-class ExceptionState;
 class Element;
+class ExceptionState;
 class HTMLCollection;
 class NameNodeList;
-template <typename NodeType>
-class StaticNodeTypeList;
-using StaticElementList = StaticNodeTypeList<Element>;
 class RadioNodeList;
 class WhitespaceAttacher;
 
+using StaticElementList = StaticNodeTypeList<Element>;
+
 enum class DynamicRestyleFlags {
   kChildrenOrSiblingsAffectedByFocus = 1 << 0,
   kChildrenOrSiblingsAffectedByHover = 1 << 1,

third_party/blink/renderer/core/dom/mutation_record.h

@@ -32,6 +32,7 @@
 #define THIRD_PARTY_BLINK_RENDERER_CORE_DOM_MUTATION_RECORD_H_
 
 #include "third_party/blink/renderer/core/core_export.h"
+#include "third_party/blink/renderer/core/dom/static_node_list.h"
 #include "third_party/blink/renderer/core/probe/async_task_id.h"
 #include "third_party/blink/renderer/platform/bindings/script_wrappable.h"
 #include "third_party/blink/renderer/platform/heap/handle.h"
@@ -41,8 +42,7 @@ namespace blink {
 
 class Node;
 class QualifiedName;
-template <typename NodeType>
-class StaticNodeTypeList;
+
 using StaticNodeList = StaticNodeTypeList<Node>;
 
 class CORE_EXPORT MutationRecord : public ScriptWrappable {

third_party/blink/renderer/core/html/custom/element_internals.h

@@ -7,6 +7,7 @@
 
 #include "third_party/blink/renderer/bindings/core/v8/file_or_usv_string_or_form_data.h"
 #include "third_party/blink/renderer/core/dom/qualified_name.h"
+#include "third_party/blink/renderer/core/html/forms/labels_node_list.h"
 #include "third_party/blink/renderer/core/html/forms/listed_element.h"
 #include "third_party/blink/renderer/platform/bindings/script_wrappable.h"
 #include "third_party/blink/renderer/platform/wtf/casting.h"
@@ -15,7 +16,6 @@ namespace blink {
 
 class DOMTokenList;
 class HTMLElement;
-class LabelsNodeList;
 class ValidityStateFlags;
 
 class CORE_EXPORT ElementInternals : public ScriptWrappable,

third_party/blink/renderer/core/html/forms/html_data_list_element.h

@@ -32,12 +32,11 @@
 #ifndef THIRD_PARTY_BLINK_RENDERER_CORE_HTML_FORMS_HTML_DATA_LIST_ELEMENT_H_
 #define THIRD_PARTY_BLINK_RENDERER_CORE_HTML_FORMS_HTML_DATA_LIST_ELEMENT_H_
 
+#include "third_party/blink/renderer/core/html/forms/html_data_list_options_collection.h"
 #include "third_party/blink/renderer/core/html/html_element.h"
 
 namespace blink {
 
-class HTMLDataListOptionsCollection;
-
 class CORE_EXPORT HTMLDataListElement final : public HTMLElement {
   DEFINE_WRAPPERTYPEINFO();
 

third_party/blink/renderer/core/html/forms/labels_node_list.h

@@ -25,7 +25,6 @@
 #ifndef THIRD_PARTY_BLINK_RENDERER_CORE_HTML_FORMS_LABELS_NODE_LIST_H_
 #define THIRD_PARTY_BLINK_RENDERER_CORE_HTML_FORMS_LABELS_NODE_LIST_H_
 
-#include "base/memory/scoped_refptr.h"
 #include "third_party/blink/renderer/core/dom/live_node_list.h"
 
 namespace blink {

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

@@ -25,6 +25,7 @@
 
 #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"
 
@@ -38,7 +39,6 @@ class ExceptionState;
 class FormAssociated;
 class HTMLFormElement;
 class KeyboardEvent;
-class LabelsNodeList;
 class StringOrTrustedScript;
 class StringTreatNullAsEmptyStringOrTrustedScript;
 

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

@@ -28,13 +28,13 @@
 
 #include "third_party/blink/renderer/core/core_export.h"
 #include "third_party/blink/renderer/core/html/html_element.h"
+#include "third_party/blink/renderer/core/html/html_table_rows_collection.h"
 
 namespace blink {
 
 class ExceptionState;
 class HTMLCollection;
 class HTMLTableCaptionElement;
-class HTMLTableRowsCollection;
 class HTMLTableSectionElement;
 
 class CORE_EXPORT HTMLTableElement final : public HTMLElement {