Remove QmLJSDelta class

The class was only used for the Apply on Save functionality in the
QML Debugger, which got nuked in 3bf81efbe7.

Change-Id: I1842cc07d61fe84f8da23210ebac04dd4d567fce
Reviewed-by: Marco Benelli <marco.benelli@theqtcompany.com>
Reviewed-by: hjk <hjk@theqtcompany.com>

src/libs/qmljs/qmljs-lib.pri

@@ -25,7 +25,6 @@ HEADERS += \
     $$PWD/qmljspropertyreader.h \
     $$PWD/qmljsrewriter.h \
     $$PWD/qmljsicons.h \
-    $$PWD/qmljsdelta.h \
     $$PWD/qmljsplugindumper.h \
     $$PWD/qmljstypedescriptionreader.h \
     $$PWD/qmljsscopeastpath.h \
@@ -64,7 +63,6 @@ SOURCES += \
     $$PWD/qmljspropertyreader.cpp \
     $$PWD/qmljsrewriter.cpp \
     $$PWD/qmljsicons.cpp \
-    $$PWD/qmljsdelta.cpp \
     $$PWD/qmljsplugindumper.cpp \
     $$PWD/qmljstypedescriptionreader.cpp \
     $$PWD/qmljsscopeastpath.cpp \