[CSS Typed OM] Rearrange StylePropertyMap classes to match the new spec.

third_party/WebKit/Source/core/css/cssom/StylePropertyMapReadonly.idl

Index: third_party/WebKit/Source/core/css/cssom/StylePropertyMapReadonly.idl
diff --git a/third_party/WebKit/Source/core/css/cssom/StylePropertyMap.idl b/third_party/WebKit/Source/core/css/cssom/StylePropertyMapReadonly.idl
similarity index 54%
copy from third_party/WebKit/Source/core/css/cssom/StylePropertyMap.idl
copy to third_party/WebKit/Source/core/css/cssom/StylePropertyMapReadonly.idl
index 12ac4a49ee03113c14d070329bc6d2524ff7c110..3237e0b4b7d9e5f9c9ef3733f5aacaad6f4ca2b7 100644
--- a/third_party/WebKit/Source/core/css/cssom/StylePropertyMap.idl
+++ b/third_party/WebKit/Source/core/css/cssom/StylePropertyMapReadonly.idl
@@ -1,17 +1,14 @@
-// Copyright 2016 The Chromium Authors. All rights reserved.
+// Copyright 2017 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.
 
 [
     Exposed=(Window,PaintWorklet),
     RuntimeEnabled=CSSTypedOM,
-] interface StylePropertyMap {
-    [RaisesException] void append(DOMString property, (CSSStyleValue or sequence<CSSStyleValue> or DOMString) value);
-    [RaisesException, ImplementedAs=remove] void delete(DOMString property);
+] interface StylePropertyMapReadonly {
     [RaisesException] CSSStyleValue? get(DOMString property);
     [RaisesException] sequence<CSSStyleValue> getAll(DOMString property);
     [RaisesException] boolean has(DOMString property);
-    [RaisesException] void set(DOMString property, (CSSStyleValue or sequence<CSSStyleValue> or DOMString) value);
     iterable<DOMString, (CSSStyleValue or sequence<CSSStyleValue>)>;
     sequence<DOMString> getProperties();
 };