Don't use NEON optimized code in lpng_v163

Don't use NEON optimized code in lpng_v163

The source files required to use the NEON function are not
included so we should not try to reference those symbols.

BUG=477162
TEST=ninja -C out_arm/Release/ pdfium_diff
R=tsepez@chromium.org

Committed: https://pdfium.googlesource.com/pdfium/+/b3300162a1ebacc973ff9793029caf4db9a4f5e5

[Sam Clegg, 2015-04-15 01:04:11]

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

[Sam Clegg, 2015-04-15 01:04:12]

If you prefer we could instead include the missing .c files from libpng 1.6.3?

[Tom Sepez, 2015-04-15 16:39:28]

lgtm

[Sam Clegg, 2015-04-15 17:15:28]

The CQ bit was checked by sbc@chromium.org

[commit-bot: I haz the power, 2015-04-15 17:17:16]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2015-04-15 17:17:16]

Commit queue rejected this change because it did not recognize the base URL.
Please commit your change manually.

[Tom Sepez, 2015-04-15 17:23:36]

On 2015/04/15 17:17:16, I haz the power (commit-bot) wrote:
> Commit queue rejected this change because it did not recognize the base URL.
> Please commit your change manually.

PDFium's automation isn't all there yet, please use: 
$ git cl land

[Sam Clegg, 2015-04-15 17:24:43]

On 2015/04/15 17:23:36, Tom Sepez wrote:
> On 2015/04/15 17:17:16, I haz the power (commit-bot) wrote:
> > Commit queue rejected this change because it did not recognize the base URL.
> > Please commit your change manually.
> 
> PDFium's automation isn't all there yet, please use: 
> $ git cl land

OK.. added myself to AUTRORS too.  Is that the right thing to do?

[Tom Sepez, 2015-04-15 17:26:46]

On 2015/04/15 17:24:43, Sam Clegg wrote:
> added myself to AUTRORS too.  Is that the right thing to do?
That's fine (thanks for alphabetizing).

[Sam Clegg, 2015-04-15 17:32:05]

On 2015/04/15 17:26:46, Tom Sepez wrote:
> On 2015/04/15 17:24:43, Sam Clegg wrote:
> > added myself to AUTRORS too.  Is that the right thing to do?
> That's fine (thanks for alphabetizing).


fatal: remote error: Git access forbidden
Failed to push. If this persists, please file a bug.


Do you need to make me a committer?  (I'm already a chrome committer so maybe
I'm authenticating wrong?)

[Sam Clegg, 2015-04-15 17:53:13]

Committed patchset #2 (id:20001) manually as
b3300162a1ebacc973ff9793029caf4db9a4f5e5 (presubmit successful).

[Sam Clegg, 2015-04-15 17:58:59]

On 2015/04/15 17:53:13, Sam Clegg wrote:
> Committed patchset #2 (id:20001) manually as
> b3300162a1ebacc973ff9793029caf4db9a4f5e5 (presubmit successful).

What script do you guys use to roll DEPS?