Add missing .h files to .gn files that have a .cc file next to it in the gn file already.

third_party/WebKit/Source/core/html/BUILD.gn

 # Copyright 2016 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/split_static_library.gni")
 import("//third_party/WebKit/Source/core/core.gni")
 
 blink_core_sources("html") {
   split_count = 5
 
@@ skipping 22 matching lines @@
     "HTMLBRElement.h",
     "HTMLBaseElement.cpp",
     "HTMLBaseElement.h",
     "HTMLBodyElement.cpp",
     "HTMLBodyElement.h",
     "HTMLButtonElement.cpp",
     "HTMLButtonElement.h",
     "HTMLCanvasElement.cpp",
     "HTMLCanvasElement.h",
     "HTMLCollection.cpp",
+    "HTMLCollection.h",
     "HTMLContentElement.cpp",
     "HTMLContentElement.h",
     "HTMLDListElement.cpp",
     "HTMLDListElement.h",
     "HTMLDataListElement.cpp",
     "HTMLDataListElement.h",
     "HTMLDetailsElement.cpp",
     "HTMLDetailsElement.h",
     "HTMLDialogElement.cpp",
     "HTMLDialogElement.h",
     "HTMLDimension.cpp",
     "HTMLDimension.h",
     "HTMLDirectoryElement.cpp",
     "HTMLDirectoryElement.h",
     "HTMLDivElement.cpp",
     "HTMLDivElement.h",
     "HTMLDocument.cpp",
+    "HTMLDocument.h",
     "HTMLElement.cpp",
+    "HTMLElement.h",
     "HTMLEmbedElement.cpp",
     "HTMLEmbedElement.h",
     "HTMLFieldSetElement.cpp",
     "HTMLFieldSetElement.h",
     "HTMLFontElement.cpp",
     "HTMLFontElement.h",
     "HTMLFormControlElement.cpp",
+    "HTMLFormControlElement.h",
     "HTMLFormControlElementWithState.cpp",
+    "HTMLFormControlElementWithState.h",
     "HTMLFormControlsCollection.cpp",
     "HTMLFormControlsCollection.h",
     "HTMLFormElement.cpp",
+    "HTMLFormElement.h",
     "HTMLFrameElement.cpp",
+    "HTMLFrameElement.h",
     "HTMLFrameElementBase.cpp",
+    "HTMLFrameElementBase.h",
     "HTMLFrameOwnerElement.cpp",
+    "HTMLFrameOwnerElement.h",
     "HTMLFrameSetElement.cpp",
     "HTMLFrameSetElement.h",
     "HTMLHRElement.cpp",
     "HTMLHRElement.h",
     "HTMLHeadElement.cpp",
     "HTMLHeadElement.h",
     "HTMLHeadingElement.cpp",
     "HTMLHeadingElement.h",
     "HTMLHtmlElement.cpp",
     "HTMLHtmlElement.h",
     "HTMLIFrameElement.cpp",
+    "HTMLIFrameElement.h",
     "HTMLIFrameElementAllow.cpp",
     "HTMLIFrameElementAllow.h",
     "HTMLIFrameElementSandbox.cpp",
     "HTMLIFrameElementSandbox.h",
     "HTMLImageElement.cpp",
     "HTMLImageElement.h",
     "HTMLImageFallbackHelper.cpp",
     "HTMLImageFallbackHelper.h",
     "HTMLImageLoader.cpp",
     "HTMLImageLoader.h",
     "HTMLInputElement.cpp",
+    "HTMLInputElement.h",
     "HTMLLIElement.cpp",
     "HTMLLIElement.h",
     "HTMLLabelElement.cpp",
     "HTMLLabelElement.h",
     "HTMLLegendElement.cpp",
     "HTMLLegendElement.h",
     "HTMLLinkElement.cpp",
     "HTMLLinkElement.h",
     "HTMLMapElement.cpp",
     "HTMLMapElement.h",
     "HTMLMarqueeElement.cpp",
     "HTMLMarqueeElement.h",
     "HTMLMediaElement.cpp",
+    "HTMLMediaElement.h",
     "HTMLMediaElementControlsList.cpp",
     "HTMLMediaElementControlsList.h",
     "HTMLMediaSource.cpp",
     "HTMLMediaSource.h",
     "HTMLMenuElement.cpp",
     "HTMLMenuElement.h",
     "HTMLMenuItemElement.cpp",
     "HTMLMenuItemElement.h",
     "HTMLMetaElement.cpp",
     "HTMLMetaElement.h",
@@ skipping 17 matching lines @@
     "HTMLOptionElement.h",
     "HTMLOptionsCollection.cpp",
     "HTMLOptionsCollection.h",
     "HTMLOutputElement.cpp",
     "HTMLOutputElement.h",
     "HTMLParagraphElement.cpp",
     "HTMLParagraphElement.h",
     "HTMLParamElement.cpp",
     "HTMLParamElement.h",
     "HTMLPictureElement.cpp",
+    "HTMLPictureElement.h",
     "HTMLPlugInElement.cpp",
     "HTMLPlugInElement.h",
     "HTMLPreElement.cpp",
     "HTMLPreElement.h",
     "HTMLProgressElement.cpp",
     "HTMLProgressElement.h",
     "HTMLQuoteElement.cpp",
     "HTMLQuoteElement.h",
     "HTMLRTElement.cpp",
     "HTMLRTElement.h",
@@ skipping 11 matching lines @@
     "HTMLSourceElement.h",
     "HTMLSpanElement.cpp",
     "HTMLSpanElement.h",
     "HTMLStyleElement.cpp",
     "HTMLStyleElement.h",
     "HTMLSummaryElement.cpp",
     "HTMLSummaryElement.h",
     "HTMLTableCaptionElement.cpp",
     "HTMLTableCaptionElement.h",
     "HTMLTableCellElement.cpp",
+    "HTMLTableCellElement.h",
     "HTMLTableColElement.cpp",
     "HTMLTableColElement.h",
     "HTMLTableElement.cpp",
     "HTMLTableElement.h",
     "HTMLTablePartElement.cpp",
+    "HTMLTablePartElement.h",
     "HTMLTableRowElement.cpp",
     "HTMLTableRowElement.h",
     "HTMLTableRowsCollection.cpp",
     "HTMLTableRowsCollection.h",
     "HTMLTableSectionElement.cpp",
     "HTMLTableSectionElement.h",
     "HTMLTagCollection.cpp",
     "HTMLTagCollection.h",
     "HTMLTemplateElement.cpp",
     "HTMLTemplateElement.h",
     "HTMLTextAreaElement.cpp",
+    "HTMLTextAreaElement.h",
     "HTMLTitleElement.cpp",
     "HTMLTitleElement.h",
     "HTMLTrackElement.cpp",
     "HTMLTrackElement.h",
     "HTMLUListElement.cpp",
     "HTMLUListElement.h",
     "HTMLUnknownElement.cpp",
     "HTMLUnknownElement.h",
     "HTMLVideoElement.cpp",
     "HTMLVideoElement.h",
     "HTMLViewSourceDocument.cpp",
     "HTMLViewSourceDocument.h",
     "HTMLWBRElement.cpp",
     "HTMLWBRElement.h",
     "ImageData.cpp",
     "ImageData.h",
     "ImageDocument.cpp",
     "ImageDocument.h",
     "LabelableElement.cpp",
+    "LabelableElement.h",
     "LabelsNodeList.cpp",
     "LabelsNodeList.h",
     "LinkManifest.cpp",
     "LinkManifest.h",
     "LinkRelAttribute.cpp",
     "LinkRelAttribute.h",
     "LinkResource.cpp",
     "LinkResource.h",
     "LinkStyle.cpp",
     "LinkStyle.h",
@@ skipping 156 matching lines @@
     "parser/HTMLEntityParser.h",
     "parser/HTMLEntitySearch.cpp",
     "parser/HTMLEntitySearch.h",
     "parser/HTMLEntityTable.h",
     "parser/HTMLFormattingElementList.cpp",
     "parser/HTMLFormattingElementList.h",
     "parser/HTMLInputStream.h",
     "parser/HTMLMetaCharsetParser.cpp",
     "parser/HTMLMetaCharsetParser.h",
     "parser/HTMLParserIdioms.cpp",
+    "parser/HTMLParserIdioms.h",
     "parser/HTMLParserOptions.cpp",
     "parser/HTMLParserOptions.h",
     "parser/HTMLParserReentryPermit.cpp",
     "parser/HTMLParserReentryPermit.h",
     "parser/HTMLParserScheduler.cpp",
     "parser/HTMLParserScheduler.h",
     "parser/HTMLParserScriptRunner.cpp",
     "parser/HTMLParserScriptRunner.h",
     "parser/HTMLParserScriptRunnerHost.h",
     "parser/HTMLPreloadScanner.cpp",
@@ skipping 11 matching lines @@
     "parser/HTMLTreeBuilder.cpp",
     "parser/HTMLTreeBuilder.h",
     "parser/HTMLTreeBuilderSimulator.cpp",
     "parser/HTMLTreeBuilderSimulator.h",
     "parser/HTMLViewSourceParser.cpp",
     "parser/HTMLViewSourceParser.h",
     "parser/InputStreamPreprocessor.h",
     "parser/MarkupTokenizerInlines.h",
     "parser/NestingLevelIncrementer.h",
     "parser/PreloadRequest.cpp",
+    "parser/PreloadRequest.h",
     "parser/ResourcePreloader.cpp",
     "parser/TextDocumentParser.cpp",
     "parser/TextDocumentParser.h",
     "parser/TextResourceDecoder.cpp",
     "parser/TextResourceDecoder.h",
     "parser/TokenizedChunkQueue.cpp",
     "parser/TokenizedChunkQueue.h",
     "parser/XSSAuditor.cpp",
     "parser/XSSAuditor.h",
     "parser/XSSAuditorDelegate.cpp",
@@ skipping 50 matching lines @@
     "track/LoadableTextTrack.h",
     "track/TextTrack.cpp",
     "track/TextTrack.h",
     "track/TextTrackContainer.cpp",
     "track/TextTrackContainer.h",
     "track/TextTrackCue.cpp",
     "track/TextTrackCue.h",
     "track/TextTrackCueList.cpp",
     "track/TextTrackCueList.h",
     "track/TextTrackList.cpp",
+    "track/TextTrackList.h",
     "track/TrackBase.cpp",
     "track/TrackBase.h",
     "track/TrackEvent.cpp",
     "track/TrackListBase.h",
     "track/VideoTrack.cpp",
     "track/VideoTrack.h",
     "track/VideoTrackList.cpp",
     "track/VideoTrackList.h",
     "track/vtt/BufferedLineReader.cpp",
     "track/vtt/BufferedLineReader.h",
@@ skipping 10 matching lines @@
     "track/vtt/VTTToken.h",
     "track/vtt/VTTTokenizer.cpp",
     "track/vtt/VTTTokenizer.h",
   ]
 
   configs += [
     # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
     "//build/config/compiler:no_size_t_to_int_warning",
   ]
 }