Fix <rdar://problem/8961227> WebKit2 does not work with symlinked home directories.

Fix <rdar://problem/8961227> WebKit2 does not work with symlinked home directories.

Reviewed by Sam Weinig.

* WebProcess/mac/WebProcessMac.mm:
(WebKit::WebProcess::platformSetCacheModel):
Don't adopt an autoreleased pointer, this would lead to a crash.

(WebKit::appendSandboxParameterPath):
(WebKit::appendSandboxParameterConfPath):
(WebKit::initializeSandbox):
Clean up the sandbox parameter code and make sure that realpath is called for all parameters.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@77707 268f45cc-cd09-0410-ab3c-d52691b4dbfc