Remove unused editing related member functions from WebViewClient

LayoutTests/editing/pasteboard/interchange-newline-4-expected.txt

-EDITING DELEGATE: shouldBeginEditingInDOMRange:range from 0 of DIV > BODY > HTML > #document to 1 of DIV > BODY > HTML > #document
-EDITING DELEGATE: webViewDidBeginEditing:WebViewDidBeginEditingNotification
 EDITING DELEGATE: webViewDidChangeSelection:WebViewDidChangeSelectionNotification
 EDITING DELEGATE: webViewDidChangeSelection:WebViewDidChangeSelectionNotification
-EDITING DELEGATE: shouldChangeSelectedDOMRange:range from 3 of #text > DIV > BODY > HTML > #document to 3 of #text > DIV > BODY > HTML > #document toDOMRange:range from 3 of #text > DIV > DIV > BODY > HTML > #document to 3 of #text > DIV > DIV > BODY > HTML > #document affinity:NSSelectionAffinityDownstream stillSelecting:FALSE
 EDITING DELEGATE: webViewDidChangeSelection:WebViewDidChangeSelectionNotification
 EDITING DELEGATE: webViewDidChange:WebViewDidChangeNotification
-EDITING DELEGATE: webViewDidEndEditing:WebViewDidEndEditingNotification
 This tests for a bug where pasted content starting with an interchange newline would end up
 outside of the editable region where it was pasted. You should see 'foo\nbar' below.
 | "
 "
 | <div>
 |   contenteditable="true"
 |   id="test"
 |   "foo"
 |   <div>
 |     "bar<#selection-caret>"
 |     <br>
 | "
 non-editable
 "
 | <script>
 |   "
 runTest();
 "