Switch SnapshotTabHelper to use WebContentsUserData.

Switch SnapshotTabHelper to use WebContentsUserData.

BUG=107201
TEST=no visible change


Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=157252

[Ben Goodger (Google), 2012-09-17 21:54:01]

lgtm

[commit-bot: I haz the power, 2012-09-17 22:04:33]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/avi@chromium.org/10909282/1

[commit-bot: I haz the power, 2012-09-17 22:13:49]

Sorry for I got bad news for ya.
Compile failed with a clobber build.
Your code is likely broken or HEAD is junk. Please ensure your
code is not broken then alert the build sheriffs.
Look at the try server FAQ for more details.

[commit-bot: I haz the power, 2012-09-17 22:21:55]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/avi@chromium.org/10909282/1

[commit-bot: I haz the power, 2012-09-17 22:31:32]

Sorry for I got bad news for ya.
Compile failed with a clobber build.
Your code is likely broken or HEAD is junk. Please ensure your
code is not broken then alert the build sheriffs.
Look at the try server FAQ for more details.

[commit-bot: I haz the power, 2012-09-17 22:37:04]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/avi@chromium.org/10909282/1

[commit-bot: I haz the power, 2012-09-18 00:16:57]

Change committed as 157252