Fix issue in DecodeEscaping() in debug_stub test
Fix issue in DecodeEscaping() in debug_stub test

DecodeEscaping(data) function has an issue with repeating escaped
characters, and wrong character gets repeated.
This issue fixes it.

BUG= run_debug_stub_test fails on MIPS
TEST= ./scons platform=mips32 run_debug_stub_test

Review URL: https://codereview.chromium.org/763773003

git-svn-id: 721b910a23eff8a86f00c8fd261a7587cddf18f8@14150 fcba33aa-ac0c-11dd-b9e7-8d5594d729c2

sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client,sbc100/native_client