RFC: Fix mistake in backport of S8010118

[Omair Majid]

Hi,

I made a mistake when trying to backport S8010118 (Annotate jdk caller
sensitive methods with @sun.reflect.CallerSensitive). I had assumed
DriverManager.getCallerClass() returns the class of the caller (what
Reflection.getCallerClass() does). But it does something completely
different.

The attached patch fixes the mistake by introducing a new getCallerClass
method. This is similar to what's done in 7u [1] with the new
isDriverAllowed(Driver,Class<?>) method. This patch also ensures that
the resulting 8010118-caller_sensitive.patch does not remove any
getCallerClass methods.

Okay to push to HEAD?

Thanks,
Omair

[1] http://hg.openjdk.java.net/jdk7u/jdk7u-dev/jdk/rev/d0e8dd6dd7a5
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