NaCl: Update revision in DEPS, r7108 -> r7115
NaCl: Update revision in DEPS, r7108 -> r7115

This pulls in the following Native Client changes:

r7109: (pdox) Stop building and merging llvm-gcc. Remove old libgcc_eh build script.
r7110: (bsy) zero out memory of sbrk region.
r7111: (mcgrathr) Remove weak references in startup code, always use __libc_{init,fini}_array
r7112: (krasin) Update PNaCl UPSTREAM_REV to 43e0e25ca86f
r7113: (mcgrathr) Update chrome_rev
r7114: (jvoung) First cut at a case-by-case calling convention test. This tests passing
r7115: (krasin) Remove llvmgcc frontend support from SCons.

BUG=none
TEST=nacl_integration

Review URL: http://codereview.chromium.org/8492026

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@109098 0039d316-1c4b-4281-b951-d872f2087c98

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