Revert of Pull and build shaderc rather than use checked in lib/header

Revert of Pull and build shaderc rather than use checked in lib/header (patchset #7 id:120001 of https://codereview.chromium.org/1760493003/ )

Reason for revert:
`gclient sync` fails on bots after this change due to broken line endings in https://github.com/google/glslang/blob/master/Test/100.conf

Original issue's description:
> Pull and build shaderc rather than use checked in lib/header
> 
> GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1760493003
> 
> Committed: https://skia.googlesource.com/skia/+/7d4490ecfa4d974003f675ef004e77f85ecfadd2

TBR=jvanverth@google.com,egdaniel@google.com,bsalomon@google.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

[borenet, 2016-03-03 12:58:51]

Created Revert of Pull and build shaderc rather than use checked in lib/header

[commit-bot: I haz the power, 2016-03-03 12:59:00]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1758743003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1758743003/1

[commit-bot: I haz the power, 2016-03-03 12:59:07]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-03-03 12:59:08]

Failed to request the patch to try. Please note that binary files are still
unsupported at the moment, this is being worked on.

This could be a Rietveld flake (see http://crbug.com/401833), so if this CL has
no binary files, please re-check commit box.
Thanks for your patience.

Transient error: Can't process patch for file
third_party/shaderc/Release/shaderc_combined.lib.
Binary file is empty. Maybe the file wasn't uploaded in the first place?

[borenet, 2016-03-03 13:02:02]

On 2016/03/03 12:59:08, commit-bot: I haz the power wrote:
> Failed to request the patch to try. Please note that binary files are still
> unsupported at the moment, this is being worked on.
> 
> This could be a Rietveld flake (see http://crbug.com/401833), so if this CL
has
> no binary files, please re-check commit box.
> Thanks for your patience.
> 
> Transient error: Can't process patch for file
> third_party/shaderc/Release/shaderc_combined.lib.
> Binary file is empty. Maybe the file wasn't uploaded in the first place?

Landed manually:
https://skia.googlesource.com/skia/+/b5f0d40935feba474852c61622ee6fcb1db3727c

[borenet, 2016-03-03 13:02:11]

Description was changed from

==========
Revert of Pull and build shaderc rather than use checked in lib/header (patchset
#7 id:120001 of https://codereview.chromium.org/1760493003/ )

Reason for revert:
`gclient sync` fails on bots after this change due to broken line endings in
https://github.com/google/glslang/blob/master/Test/100.conf

Original issue's description:
> Pull and build shaderc rather than use checked in lib/header
> 
> GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...
> 
> Committed:
https://skia.googlesource.com/skia/+/7d4490ecfa4d974003f675ef004e77f85ecfadd2

TBR=jvanverth@google.com,egdaniel@google.com,bsalomon@google.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
==========

to

==========
Revert of Pull and build shaderc rather than use checked in lib/header (patchset
#7 id:120001 of https://codereview.chromium.org/1760493003/ )

Reason for revert:
`gclient sync` fails on bots after this change due to broken line endings in
https://github.com/google/glslang/blob/master/Test/100.conf

Original issue's description:
> Pull and build shaderc rather than use checked in lib/header
> 
> GOLD_TRYBOT_URL=
https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&is...
> 
> Committed:
https://skia.googlesource.com/skia/+/7d4490ecfa4d974003f675ef004e77f85ecfadd2

TBR=jvanverth@google.com,egdaniel@google.com,bsalomon@google.com
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
==========