Oilpan: tidy up finalization of InspectorEmulationAgent following r192106.

Oilpan: tidy up finalization of InspectorEmulationAgent following r192106.

Move InspectorEmulationAgent's self-reference clearing to discardAgent()
instead of doing in its destructor, as that will access an already dead
WebViewImpl object.

R=tkent
BUG=467059
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=192150

[sof, 2015-03-19 08:14:54]

sigbjornf@opera.com changed reviewers:
+ dgozman@chromium.org, oilpan-reviews@chromium.org

[sof, 2015-03-19 08:14:54]

please take a look.

dgozman@: please confirm that moving the clearing this reference out of the
destructor is complete&acceptable for non-Oilpan also.

Example layout test log,


https://storage.googleapis.com/chromium-layout-test-archives/WebKit_Win_Oilpa...

[tkent, 2015-03-19 08:41:52]

tkent@chromium.org changed reviewers:
+ tkent@chromium.org

[tkent, 2015-03-19 08:41:53]

lgtm

[sof, 2015-03-19 08:51:40]

The CQ bit was checked by sigbjornf@opera.com

[commit-bot: I haz the power, 2015-03-19 08:51:56]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1022773002/1

[haraken, 2015-03-19 08:52:45]

LGTM

[commit-bot: I haz the power, 2015-03-19 10:23:11]

Committed patchset #1 (id:1) as
https://src.chromium.org/viewvc/blink?view=rev&revision=192150

[dgozman, 2015-03-19 10:39:25]

lgtm