Debugger: Merge {baseqml,qml}debuggerclient.

Abstraction is not used after the demise of QScriptDebuggerClient
and unlikely to be used again.

Change-Id: Icdd6615eb0d1468fd9a3d717d6a7d5e44f7f7d79
Reviewed-by: Christian Stenger <christian.stenger@theqtcompany.com>

src/plugins/debugger/qml/qml.pri

@@ -1,7 +1,6 @@
 HEADERS += \
     $$PWD/qmlengine.h \
     $$PWD/qmladapter.h \
-    $$PWD/baseqmldebuggerclient.h \
     $$PWD/qmlcppengine.h \
     $$PWD/qmlv8debuggerclient.h \
     $$PWD/interactiveinterpreter.h \
@@ -12,7 +11,6 @@ HEADERS += \
 SOURCES += \
     $$PWD/qmlengine.cpp \
     $$PWD/qmladapter.cpp \
-    $$PWD/baseqmldebuggerclient.cpp \
     $$PWD/qmlcppengine.cpp \
     $$PWD/qmlv8debuggerclient.cpp \
     $$PWD/interactiveinterpreter.cpp \