Inline exception handling code into PrivateScriptRunner helpers

Inline exception handling code into PrivateScriptRunner helpers

Inline the v8::TryCatch and rethrowExceptionInPrivateScript() call into
PrivateScriptRunner's runDOMAttributeGetter(), runDOMAttributeSetter()
and runDOMMethod().

This is done to avoid duplicating the code once per actual attribute
getter/setter callback or method callback.

BUG=

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=182512

[Jens Widell, 2014-09-23 15:57:51]

jl@opera.com changed reviewers:
+ haraken@chromium.org

[Jens Widell, 2014-09-23 15:57:52]

PTAL

Nothing important, just something that seemed reasonable to do. (The TryCatch
objects showed up in my grep in the generated code.)

PS#1 is the actual fix. PS#2 moves rethrowExceptionInPrivateScript() within the
file and makes it an internal helper since it's not used outside
PrivateScriptRunner.cpp anymore. Split into two patch sets to keep the first
part readable.

[haraken, 2014-09-23 16:21:13]

LGTM

[Jens Widell, 2014-09-23 16:30:26]

The CQ bit was checked by jl@opera.com

[commit-bot: I haz the power, 2014-09-23 16:31:32]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/594213002/20001

[commit-bot: I haz the power, 2014-09-23 18:09:54]

Committed patchset #2 (id:20001) as 182512