Make code compile with clang_use_chrome_plugin (part V)

Make code compile with clang_use_chrome_plugin (part V)

This change mainly contains files in xfa/fxfa directory.
This is part of the efforts to make PDFium code compilable
by Clang chromium style plugins.

The changes are mainly the following:
-- move inline constructor/destructor of complex class/struct out-of-line;
-- add constructor/destructor of complex class/struct if not
 explicitly defined;
-- add explicit out-of-line copy constructor when needed;
-- move inline virtual functions out-of-line;
-- Properly mark virtual functions with 'override';
-- some minor cleanups;

BUG=pdfium:469
Committed: https://pdfium.googlesource.com/pdfium/+/47bcd4c5c56cdc2d63a0c2ed4e7f68e6ccf523f6

[Wei Li, 2016-06-16 00:40:36]

Patchset #2 (id:20001) has been deleted

[Wei Li, 2016-06-16 03:33:08]

weili@chromium.org changed reviewers:
+ dsinclair@chromium.org, thestig@chromium.org

[Wei Li, 2016-06-16 03:33:09]

pls review, thanks

[dsinclair, 2016-06-16 14:59:30]

The CQ bit was checked by dsinclair@chromium.org

[dsinclair, 2016-06-16 14:59:31]

lgtm

There are a few NULLs in there, but let's just do a pass later to s/NULL/nullptr
as we've done in other directories.

[commit-bot: I haz the power, 2016-06-16 14:59:36]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/2071683002/40001

[commit-bot: I haz the power, 2016-06-16 15:00:08]

Description was changed from

==========
Make code compile with clang_use_chrome_plugin (part V)

This change mainly contains files in xfa/fxfa directory.
This is part of the efforts to make PDFium code compilable
by Clang chromium style plugins.

The changes are mainly the following:
-- move inline constructor/destructor of complex class/struct out-of-line;
-- add constructor/destructor of complex class/struct if not
 explicitly defined;
-- add explicit out-of-line copy constructor when needed;
-- move inline virtual functions out-of-line;
-- Properly mark virtual functions with 'override';
-- some minor cleanups;

BUG=pdfium:469
==========

to

==========
Make code compile with clang_use_chrome_plugin (part V)

This change mainly contains files in xfa/fxfa directory.
This is part of the efforts to make PDFium code compilable
by Clang chromium style plugins.

The changes are mainly the following:
-- move inline constructor/destructor of complex class/struct out-of-line;
-- add constructor/destructor of complex class/struct if not
 explicitly defined;
-- add explicit out-of-line copy constructor when needed;
-- move inline virtual functions out-of-line;
-- Properly mark virtual functions with 'override';
-- some minor cleanups;

BUG=pdfium:469

Committed:
https://pdfium.googlesource.com/pdfium/+/47bcd4c5c56cdc2d63a0c2ed4e7f68e6ccf5...
==========

[commit-bot: I haz the power, 2016-06-16 15:00:09]

Committed patchset #2 (id:40001) as
https://pdfium.googlesource.com/pdfium/+/47bcd4c5c56cdc2d63a0c2ed4e7f68e6ccf5...