Revert of Allow overriding GN build flags

Revert of Allow overriding GN build flags (patchset #2 id:20001 of https://codereview.chromium.org/1923333002/ )

Reason for revert:
Blocking the roll


Original issue's description:
> Allow overriding GN build flags
> 
> In order to enable XFA from GN builds we need to be able to override
> pdf_enable_xfa. To do this a build_overrides/pdfium.gni file needs to be created
> in Chrome. To use that, we have to create a build_overrides/pdfium.gni file
> in PDFium that just uses the default values.
> 
> BUG=chromium:62400
> 
> Committed: https://pdfium.googlesource.com/pdfium/+/1ae572e7e35b52ce4897d1715c005a1b0f79526a

TBR=thakis@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=chromium:62400
Committed: https://pdfium.googlesource.com/pdfium/+/038bf0b129e56212a6de0989dca1ae023bb17c5d

[dsinclair, 2016-04-30 12:47:46]

Created Revert of Allow overriding GN build flags

[commit-bot: I haz the power, 2016-04-30 12:47:54]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1941563002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1941563002/1

[commit-bot: I haz the power, 2016-04-30 13:00:09]

Description was changed from

==========
Revert of Allow overriding GN build flags (patchset #2 id:20001 of
https://codereview.chromium.org/1923333002/ )

Reason for revert:
Blocking the roll


Original issue's description:
> Allow overriding GN build flags
> 
> In order to enable XFA from GN builds we need to be able to override
> pdf_enable_xfa. To do this a build_overrides/pdfium.gni file needs to be
created
> in Chrome. To use that, we have to create a build_overrides/pdfium.gni file
> in PDFium that just uses the default values.
> 
> BUG=chromium:62400
> 
> Committed:
https://pdfium.googlesource.com/pdfium/+/1ae572e7e35b52ce4897d1715c005a1b0f79...

TBR=thakis@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=chromium:62400
==========

to

==========
Revert of Allow overriding GN build flags (patchset #2 id:20001 of
https://codereview.chromium.org/1923333002/ )

Reason for revert:
Blocking the roll


Original issue's description:
> Allow overriding GN build flags
> 
> In order to enable XFA from GN builds we need to be able to override
> pdf_enable_xfa. To do this a build_overrides/pdfium.gni file needs to be
created
> in Chrome. To use that, we have to create a build_overrides/pdfium.gni file
> in PDFium that just uses the default values.
> 
> BUG=chromium:62400
> 
> Committed:
https://pdfium.googlesource.com/pdfium/+/1ae572e7e35b52ce4897d1715c005a1b0f79...

TBR=thakis@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=chromium:62400

Committed:
https://pdfium.googlesource.com/pdfium/+/038bf0b129e56212a6de0989dca1ae023bb1...
==========

[commit-bot: I haz the power, 2016-04-30 13:00:10]

Committed patchset #1 (id:1) as
https://pdfium.googlesource.com/pdfium/+/038bf0b129e56212a6de0989dca1ae023bb1...