DiffEditorManager simplify

by using EditorManager::openEditorWithContents

Change-Id: I2850648bff0f5b8f01254b9c7ce9539c1262f576
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

src/plugins/diffeditor/diffeditordocument.cpp

@@ -31,7 +31,6 @@
 #include "diffeditordocument.h"
 #include "diffeditorconstants.h"
 #include "diffeditorcontroller.h"
-#include "diffeditormanager.h"
 #include "diffutils.h"
 
 #include <utils/fileutils.h>
@@ -63,11 +62,6 @@ DiffEditorDocument::DiffEditorDocument() :
     setTemporary(true);
 }
 
-DiffEditorDocument::~DiffEditorDocument()
-{
-    DiffEditorManager::removeDocument(this);
-}
-
 /**
  * @brief Set a controller for a document
  * @param controller The controller to set.
@@ -214,8 +208,6 @@ bool DiffEditorDocument::save(QString *errorString, const QString &fileName, boo
     if (!ok)
         return false;
 
-    DiffEditorManager::removeDocument(this);
-
     setController(0);
     setDescription(QString());