Inline method operation drops NLS tags

[srikanth-sankaran]

I have a method like this:

			private char[] typeSwitchSignature(TypeBinding exprType) {
				return CharOperation.concat("(".toCharArray(), exprType.erasure().signature(), "I)I".toCharArray()); //$NON-NLS-1$ //$NON-NLS-2$
			}

and the sole call site looks like this: char[] signature = typeSwitchSignature(selectorType);

If I perform the inline method refactoring, I end up with:

char[] signature = CharOperation.concat("(".toCharArray(), selectorType.erasure().signature(), "I)I".toCharArray());

and two warnings: `Non-externalized string literal; it should be followed by //$NON-NLS