[DMC #1.9] Move DocumentMarkerListEditor to its own .h/.cpp files

third_party/WebKit/Source/core/editing/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("//third_party/WebKit/Source/core/core.gni")
 
 blink_core_sources("editing") {
   split_count = 5
   sources = [
     "CaretDisplayItemClient.cpp",
@@ skipping 175 matching lines @@
     "iterators/TextIteratorTextState.cpp",
     "iterators/TextIteratorTextState.h",
     "iterators/TextSearcherICU.cpp",
     "iterators/TextSearcherICU.h",
     "iterators/WordAwareIterator.cpp",
     "iterators/WordAwareIterator.h",
     "markers/DocumentMarker.cpp",
     "markers/DocumentMarker.h",
     "markers/DocumentMarkerController.cpp",
     "markers/DocumentMarkerController.h",
+    "markers/DocumentMarkerListEditor.cpp",
+    "markers/DocumentMarkerListEditor.h",
     "markers/RenderedDocumentMarker.h",
     "serializers/HTMLInterchange.cpp",
     "serializers/HTMLInterchange.h",
     "serializers/MarkupAccumulator.cpp",
     "serializers/MarkupAccumulator.h",
     "serializers/MarkupFormatter.cpp",
     "serializers/MarkupFormatter.h",
     "serializers/Serialization.cpp",
     "serializers/Serialization.h",
     "serializers/StyledMarkupAccumulator.cpp",
@@ skipping 104 matching lines @@
     "//third_party/WebKit/Source:config",
     "//third_party/WebKit/Source:inside_blink",
   ]
 
   deps = [
     "//testing/gmock",
     "//testing/gtest",
     "//third_party/WebKit/Source/core:core",
   ]
 }