Fixed a bug where SYZYGY_RPC_INSTANCE_ID was being overwritten by the logger agent.
Fixed a bug where SYZYGY_RPC_INSTANCE_ID was being overwritten by the
logger agent.

BUG=
R=chrisha@chromium.org, sebmarchand@chromium.org

Review URL: https://codereview.appspot.com/195940043

Eloston/syzygy,wangming28/syzygy,pombreda/syzygy,google/syzygy,Eloston/syzygy,wangming28/syzygy,sebmarchand/syzygy,sebmarchand/syzygy,google/syzygy,pombreda/syzygy,google/syzygy,ericmckean/syzygy,supriyantomaftuh/syzygy,wangming28/syzygy,google/syzygy,sebmarchand/syzygy,wangming28/syzygy,pombreda/syzygy,sebmarchand/syzygy,supriyantomaftuh/syzygy,ericmckean/syzygy,sebmarchand/syzygy,ericmckean/syzygy,pombreda/syzygy,pombreda/syzygy,ericmckean/syzygy,supriyantomaftuh/syzygy,ericmckean/syzygy,supriyantomaftuh/syzygy