Revert of Pdfium: Fix fonts leaking on ClosePage.

Revert of Pdfium: Fix fonts leaking on ClosePage. (patchset #10 id:180001 of https://codereview.chromium.org/2158023002/ )

Reason for revert:
Causes heap-use-after-free. See crbug.com/647612.

Original issue's description:
> Fix memory leaking on ClosePage.
> CFX_FontCache refactoring:
>   after this CL: Only one global CFX_FontCache used. Any cached items from it, are released, when its are not used.
> 
> BUG=79367, 48791
> 
> The fonts was not cleared after unloading pages.
> 
> Test pdf:
> 
> http://www.nasa.gov/pdf/750614main_NASA_FY_2014_Budget_Estimates-508.pdf
> 
> For this file, we have ~5 fonts per page, which equal ~1 Mb per page.
> In this PDF we have 670 pages, as result after slow scrolling(reading) full document we have ~600 Mb fonts data in memory.
> 
> memory usage of PDF Plugin:
>   before this CL: ~660 Mb
>   after this CL: ~100 Mb
> 
> Committed: https://pdfium.googlesource.com/pdfium/+/cde5101eb15b24519e89fa500fe37038bc8e2201

TBR=tsepez@chromium.org,brucedawson@chromium.org,npm@chromium.org,art-snake@yandex-team.ru
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=79367, 48791
Committed: https://pdfium.googlesource.com/pdfium/+/c48089977dc4d2a63d37e6668382c10b42e22a72

[dsinclair, 2016-09-19 15:17:44]

The CQ bit was checked by dsinclair@chromium.org

[dsinclair, 2016-09-19 15:17:45]

Created Revert of Pdfium: Fix fonts leaking on ClosePage.

[commit-bot: I haz the power, 2016-09-19 15:17:48]

CQ is trying da patch. Follow status at
 
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2016-09-19 15:37:17]

Description was changed from

==========
Revert of Pdfium: Fix fonts leaking on ClosePage. (patchset #10 id:180001 of
https://codereview.chromium.org/2158023002/ )

Reason for revert:
Causes heap-use-after-free. See crbug.com/647612.

Original issue's description:
> Fix memory leaking on ClosePage.
> CFX_FontCache refactoring:
>   after this CL: Only one global CFX_FontCache used. Any cached items from it,
are released, when its are not used.
> 
> BUG=79367,48791
> 
> The fonts was not cleared after unloading pages.
> 
> Test pdf:
> 
> http://www.nasa.gov/pdf/750614main_NASA_FY_2014_Budget_Estimates-508.pdf
> 
> For this file, we have ~5 fonts per page, which equal ~1 Mb per page.
> In this PDF we have 670 pages, as result after slow scrolling(reading) full
document we have ~600 Mb fonts data in memory.
> 
> memory usage of PDF Plugin:
>   before this CL: ~660 Mb
>   after this CL: ~100 Mb
> 
> Committed:
https://pdfium.googlesource.com/pdfium/+/cde5101eb15b24519e89fa500fe37038bc8e...

TBR=tsepez@chromium.org,brucedawson@chromium.org,npm@chromium.org,art-snake@y...
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=79367,48791
==========

to

==========
Revert of Pdfium: Fix fonts leaking on ClosePage. (patchset #10 id:180001 of
https://codereview.chromium.org/2158023002/ )

Reason for revert:
Causes heap-use-after-free. See crbug.com/647612.

Original issue's description:
> Fix memory leaking on ClosePage.
> CFX_FontCache refactoring:
>   after this CL: Only one global CFX_FontCache used. Any cached items from it,
are released, when its are not used.
> 
> BUG=79367,48791
> 
> The fonts was not cleared after unloading pages.
> 
> Test pdf:
> 
> http://www.nasa.gov/pdf/750614main_NASA_FY_2014_Budget_Estimates-508.pdf
> 
> For this file, we have ~5 fonts per page, which equal ~1 Mb per page.
> In this PDF we have 670 pages, as result after slow scrolling(reading) full
document we have ~600 Mb fonts data in memory.
> 
> memory usage of PDF Plugin:
>   before this CL: ~660 Mb
>   after this CL: ~100 Mb
> 
> Committed:
https://pdfium.googlesource.com/pdfium/+/cde5101eb15b24519e89fa500fe37038bc8e...

TBR=tsepez@chromium.org,brucedawson@chromium.org,npm@chromium.org,art-snake@y...
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG=79367,48791

Committed:
https://pdfium.googlesource.com/pdfium/+/c48089977dc4d2a63d37e6668382c10b42e2...
==========

[commit-bot: I haz the power, 2016-09-19 15:37:18]

Committed patchset #1 (id:1) as
https://pdfium.googlesource.com/pdfium/+/c48089977dc4d2a63d37e6668382c10b42e2...