Update core/dom/README.md to have the link to the spreadsheet

TBR=dcheng@chromium.org

Bug: 738794
Change-Id: I7097e4cbadcde235248cf0affc2b9c26bc845e0a
Reviewed-on: https://chromium-review.googlesource.com/564900
Commit-Queue: Hayato Ito <hayato@chromium.org>
Reviewed-by: Hayato Ito <hayato@chromium.org>
Cr-Commit-Position: refs/heads/master@{#485223}

third_party/WebKit/Source/core/dom/README.md

@@ -16,177 +16,9 @@ Please don't add unrelated files to this directory any more.  We are trying to
 organize the files so that developers wouldn't get confused at seeing this
 directory.
 
-See [crbug.com/738794](http://crbug.com/738794) for tracking our efforts.
+-   See the [spreadsheet](https://docs.google.com/spreadsheets/d/1OydPU6r8CTj8HC4D9_gVkriJETu1Egcw2RlajYcw3FM/edit?usp=sharing), as a rough plan to organize Source/core/dom files.
 
-As of now, the following files might be candidates which can be put in other
-appropriate directory, including, but not limited to:
+    The classification in the spreadsheet might be wrong. Please update the spreadsheet, and move files if you can,
+    if you know more appropriate places for each file.
 
-## WebIDL (-> core/???)
-
-- CommonDefinitions
-
-## Frame (core/frame)
-
-- ChildFrameDisconnector
-- CompositorWorkerProxyClient
-- ContextFeatures
-- ContextFeaturesClientImpl
-- ContextLifecycleNotifier
-- FrameRequestCallback
-- FrameRequestCallbackCollection
-- ViewportDescription
-
-## Animation  (-> core/animation)
-
-- AnimationWorkletProxyClient
-- ScriptedAnimationController
-
-## CSSOM (-> core/css/cssom)
-
-- ClientRect
-- ClientRectList
-
-## CSS (-> core/css)
-
-- CSSSelectorWatch
-- SelectRuleFeatureSet
-- SelectorQuery
-
-## Events (-> core/events)
-
-- SimulatedClickOptions
-- Touch
-- TouchInit
-- TouchList
-
-## Style (-> core/styles)
-
-- DocumentStyleSheetCollection
-- ShadowTreeStyleSheetCollection
-- StyleChangeReason
-- StyleElement (-> core/html?)
-- StyleEngine
-- StyleEngineContext
-- StyleSheetCandidate
-- StyleSheetCollection
-- TreeScopeStyleSheetCollection
-- stylerecalc.md
-
-## accessibility (-> modules/accessibility?)
-
-- AXObjectCache
-- AXObjectCacheBase
-- AccessibleNode
-
-## typedarray (-> new directory, core/typedarray?)
-
-- ArrayBuffer
-- ArrayBufferView
-- ArrayBufferViewHelpers
-- DOMArrayBuffer
-- DOMArrayBufferView
-- DOMArrayPiece
-- DOMDataView
-- DOMSharedArrayBuffer
-- DOMTypedArray
-- DataView
-- FlexibleArrayBufferView
-- Float32Array
-- Float64Array
-- Int16Array
-- Int32Array
-- Int8Array
-- SharedArrayBuffer
-- TypedFlexibleArrayBufferView
-- Uint16Array
-- Uint32Array
-- Uint8Array
-- Uint8ClampedArray
-
-# URL (-> core/url?)
-
-- URL
-- URLSearchParams
-- URLUtilsReadOnly
-
-## Parser (-> core/html/parser)
-
-- DecodedDataDocumentParser
-- DocumentParser
-- DocumentParserClient
-- DocumentParserTiming
-- RawDataDocumentParser
-- ScriptableDocumentParser
-
-## Script (-> core/html)
-
-- FunctionStringCallback
-- Script
-- ScriptElementBase
-- ScriptLoader
-- ScriptModuleResolver
-- ScriptModuleResolverImpl
-- ScriptRunner
-- ScriptedIdleTaskController
-
-## HTML Element (-> core/html)
-
-- FirstLetterPseudoElement
-- PseudoElement
-- PseudoElementData
-- VisitedLinkState (HTMLLinkElement)
-
-## [Fullscreen](https://fullscreen.spec.whatwg.org/) (-> core/fullscreen)
-
-- DocumentFullscreen
-- ElementFullscreen
-- Fullscreen
-
-## [Message Channels](https://html.spec.whatwg.org/#message-channels) (-> core/html)
-
-- AncestorList
-- ClassicPendingScript, ClassicScript
-- MessageChannel
-- MessagePort
-
-## ES6 Modules (-> ???)
-
-- Modulator
-- ModulatorImpl
-- ModuleMap
-
-## [Intersection Observer](https://wicg.github.io/IntersectionObserver/) (-> core/intersection-observer)
-
-- IntersectionObservation
-- IntersectionObserver
-- IntersectionObserverCallback
-- IntersectionObserverController
-- IntersectionObserverEntry
-- IntersectionObserverInit
-
-## Security (-> core/frame/csp or core/frame)
-
-- RemoteSecurityContext
-- SecurityContext
-
-## Layout (-> core/layout)
-
-- ResizeObservation
-- ResizeObserver
-- ResizeObserverController
-- ResizeObserverEntry
-- WhitespaceAttacher
-- WhitespaceLayoutObjects.md
-
-## iframe (-> core/html?)
-
-- SandboxFlags
-
-## Focus (-> core/page)
-
-- ScopedWindowFocusAllowedIndicator
-- SlotScopedTraversal
-
-
-Note: The above classification might be wrong. Please fix this README.md, and move
-files if you can, if you know more appropriate places for each file.
+-   See [crbug.com/738794](http://crbug.com/738794) for tracking our efforts.