Fix failure to use shared relro on load from a zip file.

Fix failure to use shared relro on load from a zip file.

When loading from a zip file, record the path to the zip file,
rather that the name of the item within the zip file, as being
the name of the loaded library.

Fixes failure to use shared relro, visible in logcat as:
  E/chromium_android_linker(19916): UseSharedRelro: Could not find libchrome.2192.0.so
  W/chromium_android_linker(19916): Could not use shared RELRO section for libchrome.2192.0.so

Note: load from zip file currently supports only a single shared
library within any given zip file.

BUG=390618
Committed: https://crrev.com/a6edc5a75e110244ed499da609b34e2b56024560
Cr-Commit-Position: refs/heads/master@{#300124}

[simonb (inactive), 2014-10-17 16:22:52]

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

[rmcilroy, 2014-10-17 16:36:49]

On 2014/10/17 16:22:52, simonb wrote:

lgtm, thanks!

[simonb (inactive), 2014-10-17 16:39:26]

The CQ bit was checked by simonb@chromium.org

[commit-bot: I haz the power, 2014-10-17 16:40:33]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/667443002/1

[commit-bot: I haz the power, 2014-10-17 17:39:44]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2014-10-17 17:40:27]

Patchset 1 (id:??) landed as
https://crrev.com/a6edc5a75e110244ed499da609b34e2b56024560
Cr-Commit-Position: refs/heads/master@{#300124}