Kill IFX_FontMapper

Kill IFX_FontMapper

The design envisioned two kinds of font mappers: internal
(of type CFX_FontMapper), and external, both of which
implement a common interface.  But there isn't any means of
making an external one, so the interface is redundant.

IFX_FontMapper also appears in an apple-specific struct,
but was never non-null or used in any way.

The CFX_FontMapper class provides its own mechanism to
include platform-specific features, as it turns out.

R=thestig@chromium.org

Committed: https://pdfium.googlesource.com/pdfium/+/01fa1efb228acdcf5250804c670107133668e4b2

[Tom Sepez, 2015-07-31 19:56:07]

tsepez@chromium.org changed reviewers:
+ thestig@chromium.org

[Tom Sepez, 2015-07-31 19:56:16]

Lei, for review.

[Lei Zhang, 2015-07-31 20:23:30]

lgtm

https://codereview.chromium.org/1259123005/diff/1/core/include/fxge/fx_font.h
File core/include/fxge/fx_font.h (right):

https://codereview.chromium.org/1259123005/diff/1/core/include/fxge/fx_font.h...
core/include/fxge/fx_font.h:249: CFX_FontMapper(CFX_FontMgr* mgr);
explicit

https://codereview.chromium.org/1259123005/diff/1/core/include/fxge/fx_font.h...
core/include/fxge/fx_font.h:284: 
Extra blank line here?

[Tom Sepez, 2015-07-31 21:00:44]

Committed patchset #2 (id:20001) manually as
01fa1efb228acdcf5250804c670107133668e4b2 (presubmit successful).