Revert of Make GL bindings conditional

Revert of Make GL bindings conditional (patchset #12 id:120001 of https://codereview.chromium.org/871763002/)

Reason for revert:
Suspected of breaking WebGL on ARM (Mali) Chrome OS.

BUG=454816
Original issue's description:
> Make GL bindings conditional
> 
> In addition to the extensions also parse GL/GLES version
> information from the headers (hence add a few fresh headers).
> 
> Instead of brute-forcing binding in somewhat unclear order
> make all dynamic bindings very specifically conditional to
> the GL version or extension, given the precise name.
> If a function is not available, then leave function pointer
> set to NULL so it will generate a crash (report).
> (Previously it might have ended up as 0
> or with whatever valid or not valid pointer GetProcAddr()
> returned - i.e. GetProcAddr returning something does not
> imply the functionality is there.)
> 
> The version also includes whether it is GLES or not which
> means we won't look up functions on GLES anymore that are
> specific to desktop or vice versa.
> 
> Update gpu_unittests so that they are very specific to what
> extensions they need (otherwise they might end up calling
> the _NotBound fallback).
> 
> Also make WGL/GLX/EGL/MESA bindings all happen rightaway since
> they don't depend on a context.
> 
> BUG=438742, 325668
> 
> Committed: https://crrev.com/e3b17fd533b81a9855a28d04894021479cd6d89d
> Cr-Commit-Position: refs/heads/master@{#313663}

TBR=kbr@chromium.org,vmiura@chromium.org,zmo@chromium.org,piman@chromium.org,sievers@chromium.org

BUG=438742, 325668

[Daniel Kurtz, 2015-02-03 16:13:39]

Created Revert of Make GL bindings conditional

[commit-bot: I haz the power, 2015-02-03 16:14:13]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/893213002/1

[commit-bot: I haz the power, 2015-02-03 16:14:14]

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

[commit-bot: I haz the power, 2015-02-03 16:14:15]

No LGTM from a valid reviewer yet. Only full committers are accepted.
Even if an LGTM may have been provided, it was from a non-committer,
_not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[Zhenyao Mo, 2015-02-03 17:19:55]

We have other CLs landed on top of this one.  Just reverting this will
definitely break something.

The fact it only broke WebGL on a special device indicates a driver bug or
something.  I feel debugging and fixing the bug is an easier path forward, but
sievers should evaluate and decide.

[no sievers, 2015-02-03 18:40:24]

We need to fix this (not revert), since this is an urgent M41 blocker for
Android.

[no sievers, 2015-02-03 19:59:59]

Did you verify that reverting this patch fixes the issue?
Because it does not for me.

[no sievers, 2015-02-04 00:44:51]

Should be fixed with https://codereview.chromium.org/887113003/

[Daniel Kurtz, 2015-02-04 00:46:11]

On 2015/02/04 00:44:51, sievers wrote:
> Did you verify that reverting this patch fixes the issue?

Yes - but by now I think you were able to verify that, too :-).

> Should be fixed with https://codereview.chromium.org/887113003/

Awesome, thanks for the quick turn-around!  I'll give it a try today.

[Zhenyao Mo, 2015-02-10 23:13:31]

Can we close this CL?  The bug is already fixed, so we no longer need this one.