Selection API: add removeRange().

third_party/WebKit/Source/core/editing/DOMSelection.cpp

 /*
  * Copyright (C) 2007, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 563 matching lines @@
     return nullptr;
   return frame()->selection().documentCachedRange();
 }
 
 void DOMSelection::clearCachedRangeIfSelectionOfDocument() {
   if (!isSelectionOfDocument())
     return;
   frame()->selection().clearDocumentCachedRange();
 }
 
+void DOMSelection::removeRange(Range* range) {
+  DCHECK(range);
+  if (!isAvailable())
+    return;
+  if (range == primaryRangeOrNull())

[yosin_UTC9, 2017/02/24 14:47:55]

nit: I prefer early-return style:

if (range != primaryRangeOrNull())
  return;
frame()->selection().clear();

[tkent, 2017/02/24 17:44:12]

I prefer early-return in general.  However, not-early-return is simpler in this
case.

+    frame()->selection().clear();
+}
+
 void DOMSelection::removeAllRanges() {
   if (!isAvailable())
     return;
   frame()->selection().clear();
 }
 
 void DOMSelection::addRange(Range* newRange) {
   DCHECK(newRange);
 
   if (!isAvailable())
@@ skipping 213 matching lines @@
     m_treeScope->document().addConsoleMessage(
         ConsoleMessage::create(JSMessageSource, ErrorMessageLevel, message));
 }
 
 DEFINE_TRACE(DOMSelection) {
   visitor->trace(m_treeScope);
   ContextClient::trace(visitor);
 }
 
 }  // namespace blink