Chasing Symfony HEAD. :-) This is just a straight up update of the 6 components we have in core right now. In particular, there's 2 changes that make it important to do now:
1) Symfony recently moved all of their component unit tests into the components, to make it easier to spin off the components. (Fabien and Lukas has been discussing that at DrupalCon Denver.) So it now includes all of the unit tests for the components we're using. That's why the patch file is so huge.
2) It includes a couple of commits I've added to HttpFoundation/HttpKernel to help with the kernel patch. Specifically, it makes it possible (I believe) to bridge to our existing error handling system without rewriting the whole thing right now. For that reason I am marking this as major since it blocks the kernel.
There are no other changes outside of the vendor directory.
Let the Drupal commit message show that this corresponds to Symfony commit ID b0a6956bdc0e9ae39adf28b38037a9a905322916. (For later tracking purposes.)
PASSED: [[SimpleTest]]: [MySQL] 35,414 pass(es).
FAILED: [[SimpleTest]]: [MySQL] Invalid PHP syntax in core/vendor/Symfony/Component/ClassLoader/Tests/Fixtures/php5.4/traits.php.
FAILED: [[SimpleTest]]: [MySQL] Unable to apply patch symfony-update_2.patch. Unable to apply patch. See the log in the details link for more information.