Move InfoBar to Utils

The only reason it was required to be in Core plugin, was its use of Id,
which now is available in Utils.

Change-Id: I66ce863c24924e6448d339b3422538a7fe167336
Reviewed-by: Alessandro Portale <alessandro.portale@qt.io>
Reviewed-by: Orgad Shaneh <orgads@gmail.com>

src/plugins/cppeditor/cppminimizableinfobars.cpp

@@ -31,15 +31,16 @@
 #include <QToolButton>
 
 #include <coreplugin/id.h>
-#include <coreplugin/infobar.h>
 
 #include <cpptools/cpptoolssettings.h>
 
-#include <utils/utilsicons.h>
+#include <utils/infobar.h>
 #include <utils/qtcassert.h>
+#include <utils/utilsicons.h>
 
 using namespace Core;
 using namespace CppTools;
+using namespace Utils;
 
 namespace CppEditor {
 namespace Internal {