Debugger: Remove DebuggerCommand::arg(FilePath)

It's better when the user code has to be explicit in what
format and/or which parts of the FilePath is needed.

Change-Id: I9d70e073f853a1bbc47c8482ebe77d7c4612b4b7
Reviewed-by: Marcus Tillmanns <marcus.tillmanns@qt.io>
Reviewed-by: hjk <hjk@qt.io>

src/plugins/debugger/debuggerprotocol.h

@@ -41,7 +41,6 @@ public:
     void arg(const char *name, const QList<int> &list);
     void arg(const char *name, const QStringList &list); // Note: Hex-encodes.
     void arg(const char *name, const QJsonValue &value);
-    void arg(const char *name, const Utils::FilePath &filePath);
 
     QString argsToPython() const;
     QString argsToString() const;