This reverts commit 59d9da08.

Reason for revert: <INSERT REASONING HERE>

Original change's description:
> Remove IndexRange retrieving in validation
> 
> This change can improve the performance of drawElements which uses
> the path without translation.
> Paste a set of mean data (repeated 30) for reference on Intel skylake
> Win10 desktop.
> DrawElementsPerfBenchmark.Run/d3d11:
> before                     after
> mean: 13644.4666667 -> mean: 13887.8333333
> DrawElementsPerfBenchmark.Run/d3d11_index_buffer_changed:
> before                     after
> mean: 45.8          -> mean: 46.3666666667
> 
> BUG=755897, angleproject:1393
> 
> Change-Id: I11f5db25445346958dfef52b1d23df5483cda32f
> Reviewed-on: https://chromium-review.googlesource.com/607413
> Reviewed-by: Geoff Lang <geofflang@chromium.org>
> Reviewed-by: Jamie Madill <jmadill@chromium.org>
> Commit-Queue: Jamie Madill <jmadill@chromium.org>

TBR=geofflang@chromium.org,jmadill@chromium.org,jiajia.qin@intel.com

Change-Id: I4b00af2c32af36aa978ac2fddcf7514134497cf3
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 755897, angleproject:1393
Reviewed-on: https://chromium-review.googlesource.com/633296Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Corentin Wallez <cwallez@chromium.org>