TextEditor: Make completion assist provider a data member

In case of the CppEditor a direct member is not possible due
to setup restrictions inside the CppEditor machinery. I'd expect
that to be fixable when the editor base system is in good shape.

Change-Id: I184e219ca2dff6f67c9b58c182212eb12972cc84
Reviewed-by: Christian Stenger <christian.stenger@digia.com>

src/plugins/android/javaeditor.cpp

@@ -56,6 +56,7 @@ JavaEditor::JavaEditor(JavaEditorWidget *editor)
               TextEditor::Constants::C_TEXTEDITOR));
     setDuplicateSupported(true);
     setCommentStyle(Utils::CommentDefinition::CppStyle);
+    setCompletionAssistProvider(ExtensionSystem::PluginManager::getObject<JavaCompletionAssistProvider>());
 }
 
 Core::IEditor *JavaEditor::duplicate()
@@ -66,11 +67,6 @@ Core::IEditor *JavaEditor::duplicate()
     return ret->editor();
 }
 
-TextEditor::CompletionAssistProvider *JavaEditor::completionAssistProvider()
-{
-    return ExtensionSystem::PluginManager::getObject<JavaCompletionAssistProvider>();
-}
-
 //
 // JavaEditorWidget
 //