Remove unused editing related member functions from WebViewClient

LayoutTests/editing/pasteboard/interchange-newline-1-expected.txt

Index: LayoutTests/editing/pasteboard/interchange-newline-1-expected.txt
diff --git a/LayoutTests/editing/pasteboard/interchange-newline-1-expected.txt b/LayoutTests/editing/pasteboard/interchange-newline-1-expected.txt
index e3ae3dded4b266861ea11c155b903dabd330e35f..66bd66c52b839f83892aa0f8b9964604c1fa0d80 100644
--- a/LayoutTests/editing/pasteboard/interchange-newline-1-expected.txt
+++ b/LayoutTests/editing/pasteboard/interchange-newline-1-expected.txt
@@ -1,11 +1,8 @@
-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: webViewDidChangeSelection:WebViewDidChangeSelectionNotification
 EDITING DELEGATE: webViewDidChangeSelection:WebViewDidChangeSelectionNotification
 EDITING DELEGATE: webViewDidChange:WebViewDidChangeNotification
-EDITING DELEGATE: webViewDidEndEditing:WebViewDidEndEditingNotification
 There is an interchange newline at the end of the incoming fragment. "bar" and "x" should be in separate paragraphs
 The paragraph "bar" is inside a div wrapped in a span, and the old paste code that handled interchange newlines did not handle this case.
 | "xfoo"