Revert of Add null check to animations for registered custom property initial values

Revert of Add null check to animations for registered custom property initial values (patchset #2 id:20001 of https://codereview.chromium.org/2649863006/ )

Reason for revert:
This goes together with the revert https://codereview.chromium.org/2649103008/ ; looks like the two CLs didn't match up, 

 https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Mac10.10/builds/29275

(Hope the double revert doesn't cause too much work.)

Original issue's description:
> Add null check to animations for registered custom property initial values
> 
> After a recent change to CSSInterpolationType for registered custom properties
> it was assumed that all registered custom properties had initial CSSValues.
> This is not the case and null derefs were reachable. This patch fixes up
> the false assumption.
> 
> BUG=684234
> 
> Review-Url: https://codereview.chromium.org/2649863006
> Cr-Commit-Position: refs/heads/master@{#445969}
> Committed: https://chromium.googlesource.com/chromium/src/+/f2ec8922cbe5f632a937cf242faf5f23c0d1b3ff

TBR=ericwilligers@chromium.org,alancutter@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=684234
Review-Url: https://codereview.chromium.org/2650403002
Cr-Commit-Position: refs/heads/master@{#445996}
Committed: https://chromium.googlesource.com/chromium/src/+/af23a0c634f77c940bc54aea0c92880c1f3c4e6c

[sof, 2017-01-25 11:11:56]

The CQ bit was checked by sigbjornf@opera.com

[sof, 2017-01-25 11:11:57]

Created Revert of Add null check to animations for registered custom property
initial values

[commit-bot: I haz the power, 2017-01-25 11:12:10]

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, 2017-01-25 11:12:48]

CQ is committing da patch.

Bot data: {"patchset_id": 1, "attempt_start_ts": 1485342716792010, "parent_rev":
"5fba2166ddb709508371545bdb88a9c87929615d", "commit_rev":
"af23a0c634f77c940bc54aea0c92880c1f3c4e6c"}

[commit-bot: I haz the power, 2017-01-25 11:13:23]

Description was changed from

==========
Revert of Add null check to animations for registered custom property initial
values (patchset #2 id:20001 of https://codereview.chromium.org/2649863006/ )

Reason for revert:
This goes together with the revert https://codereview.chromium.org/2649103008/ ;
looks like the two CLs didn't match up, 


https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Mac10.10/build...

(Hope the double revert doesn't cause too much work.)

Original issue's description:
> Add null check to animations for registered custom property initial values
> 
> After a recent change to CSSInterpolationType for registered custom properties
> it was assumed that all registered custom properties had initial CSSValues.
> This is not the case and null derefs were reachable. This patch fixes up
> the false assumption.
> 
> BUG=684234
> 
> Review-Url: https://codereview.chromium.org/2649863006
> Cr-Commit-Position: refs/heads/master@{#445969}
> Committed:
https://chromium.googlesource.com/chromium/src/+/f2ec8922cbe5f632a937cf242faf...

TBR=ericwilligers@chromium.org,alancutter@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=684234
==========

to

==========
Revert of Add null check to animations for registered custom property initial
values (patchset #2 id:20001 of https://codereview.chromium.org/2649863006/ )

Reason for revert:
This goes together with the revert https://codereview.chromium.org/2649103008/ ;
looks like the two CLs didn't match up, 


https://build.chromium.org/p/chromium.webkit/builders/WebKit%20Mac10.10/build...

(Hope the double revert doesn't cause too much work.)

Original issue's description:
> Add null check to animations for registered custom property initial values
> 
> After a recent change to CSSInterpolationType for registered custom properties
> it was assumed that all registered custom properties had initial CSSValues.
> This is not the case and null derefs were reachable. This patch fixes up
> the false assumption.
> 
> BUG=684234
> 
> Review-Url: https://codereview.chromium.org/2649863006
> Cr-Commit-Position: refs/heads/master@{#445969}
> Committed:
https://chromium.googlesource.com/chromium/src/+/f2ec8922cbe5f632a937cf242faf...

TBR=ericwilligers@chromium.org,alancutter@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=684234

Review-Url: https://codereview.chromium.org/2650403002
Cr-Commit-Position: refs/heads/master@{#445996}
Committed:
https://chromium.googlesource.com/chromium/src/+/af23a0c634f77c940bc54aea0c92...
==========

[commit-bot: I haz the power, 2017-01-25 11:13:25]

Committed patchset #1 (id:1) as
https://chromium.googlesource.com/chromium/src/+/af23a0c634f77c940bc54aea0c92...