Remove unused variables in the relocation packer.

Remove unused variables in the relocation packer.

Fixes, in clang/gn builds, four occurrences of:
  ../../tools/relocation_packer/src/elf_file.cc: error: unused variable...

BUG=385553
Committed: https://crrev.com/ec6aa278c5e9361feb340753d5174dec21556e15
Cr-Commit-Position: refs/heads/master@{#299279}

[simonb (inactive), 2014-10-10 16:16:12]

simonb@chromium.org changed reviewers:
+ rmcilroy@chromium.org

[rmcilroy, 2014-10-11 11:58:13]

On 2014/10/10 16:16:12, simonb wrote:

lgtm, thanks.

[simonb (inactive), 2014-10-13 10:20:54]

The CQ bit was checked by simonb@chromium.org

[commit-bot: I haz the power, 2014-10-13 10:21:46]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/645073002/1

[commit-bot: I haz the power, 2014-10-13 10:37:17]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-10-13 10:38:07]

Patchset 1 (id:??) landed as
https://crrev.com/ec6aa278c5e9361feb340753d5174dec21556e15
Cr-Commit-Position: refs/heads/master@{#299279}