Revert of Use visual studio toolchain from depot_tools for PDFium compilation

Revert of Use visual studio toolchain from depot_tools for PDFium compilation (patchset #3 id:40001 of https://codereview.chromium.org/1897523002/ )

Reason for revert:
Clang build is broken. drm build has some problem. Will revert this change for now.

Original issue's description:
> Use visual studio toolchain from depot_tools for PDFium compilation
> 
> Change to use visual studio toolchain from depot_tools by default.
> Setting DEPOT_TOOLS_WIN_TOOLCHAIN=0 allows compilation using system
> toolchain as before.
> 
> Using toolchain from depot_tools unifies the compilation
> environment, and brings the benefits of automated update, bug fixes
> etc.
> 
> Committed: https://pdfium.googlesource.com/pdfium/+/590f2d9e057a0d5b17a9706affd3c6115265021b

TBR=brucedawson@chromium.org,thestig@chromium.org,tsepez@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Committed: https://pdfium.googlesource.com/pdfium/+/df96690d4e3799536b981e3673d64018fa5fd037

[Wei Li, 2016-04-27 23:14:22]

Created Revert of Use visual studio toolchain from depot_tools for PDFium
compilation

[commit-bot: I haz the power, 2016-04-27 23:14:30]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1922373003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1922373003/1

[commit-bot: I haz the power, 2016-04-27 23:14:38]

Description was changed from

==========
Revert of Use visual studio toolchain from depot_tools for PDFium compilation
(patchset #3 id:40001 of https://codereview.chromium.org/1897523002/ )

Reason for revert:
Clang build is broken. drm build has some problem. Will revert this change for
now.

Original issue's description:
> Use visual studio toolchain from depot_tools for PDFium compilation
> 
> Change to use visual studio toolchain from depot_tools by default.
> Setting DEPOT_TOOLS_WIN_TOOLCHAIN=0 allows compilation using system
> toolchain as before.
> 
> Using toolchain from depot_tools unifies the compilation
> environment, and brings the benefits of automated update, bug fixes
> etc.
> 
> Committed:
https://pdfium.googlesource.com/pdfium/+/590f2d9e057a0d5b17a9706affd3c6115265...

TBR=brucedawson@chromium.org,thestig@chromium.org,tsepez@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
==========

to

==========
Revert of Use visual studio toolchain from depot_tools for PDFium compilation
(patchset #3 id:40001 of https://codereview.chromium.org/1897523002/ )

Reason for revert:
Clang build is broken. drm build has some problem. Will revert this change for
now.

Original issue's description:
> Use visual studio toolchain from depot_tools for PDFium compilation
> 
> Change to use visual studio toolchain from depot_tools by default.
> Setting DEPOT_TOOLS_WIN_TOOLCHAIN=0 allows compilation using system
> toolchain as before.
> 
> Using toolchain from depot_tools unifies the compilation
> environment, and brings the benefits of automated update, bug fixes
> etc.
> 
> Committed:
https://pdfium.googlesource.com/pdfium/+/590f2d9e057a0d5b17a9706affd3c6115265...

TBR=brucedawson@chromium.org,thestig@chromium.org,tsepez@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Committed:
https://pdfium.googlesource.com/pdfium/+/df96690d4e3799536b981e3673d64018fa5f...
==========

[commit-bot: I haz the power, 2016-04-27 23:14:39]

Committed patchset #1 (id:1) as
https://pdfium.googlesource.com/pdfium/+/df96690d4e3799536b981e3673d64018fa5f...

[Wei Li, 2016-04-28 22:26:28]

A revert of this CL (patchset #1 id:1) has been created in
https://codereview.chromium.org/1927373002/ by weili@chromium.org.

The reason for reverting is: I fixed Clang build config, and updated drm binary.
Should work this time..