Update adblockplus dependency to revision hg:5434ef6e1545

[sergz]

Background

ensure_dependencies.py is already obsolete and to update it we usually update buildtools which comes from adblockpus submodule (subrepository).

The list of changes imported by this is:

Ticket	Summary	Component
#2659	Reduce initial notification download delay to one minute	Core
#2609	Update buildtools dependency to revision bdd544d595f2	Adblock-Plus-for-Firefox
#2592	Regression: URL-specific notifications are broken	Core
#2582	ElemHide.getSelectorsForDomain() cannot be optimized by V8	Core
#2510	Support Adblock Browser in Adblock Plus for Firefox	Adblock-Plus-for-Firefox
#2503	Inconsistent behavior: $document flag implied for exception rules with protocol included	Core
#2439	Make suppress_first_run_page preconfigurable	Adblock-Plus-for-Firefox
#2438	Update buildtools dependency to revision 97e2e12af6e8	Adblock-Plus-for-Firefox
#2420	[Move notification display logic to Core] Make it possible to register a notification show listener	Core
#2419	Show newly downloaded notifications immediately	Core
#2390	Create a new filter class for CSS property filters	Core
#2264	Remove deprecated logic from Utils.runAsync() on Firefox	Adblock-Plus-for-Firefox
#2260	Icon doesn't change when disabling ABP	Adblock-Plus-for-Firefox
#2257	Replace non-standard function expressions with ES6 arrow functions	Adblock-Plus-for-Firefox
#2255	IO.writeToFile() doesn't support ES6 generators	Adblock-Plus-for-Firefox
#2251	Update buildtools dependency to 335c8a7ab8e8	Adblock-Plus-for-Firefox
#2233	Adapt array type annotations for JsDoc 3	Adblock-Plus-for-Firefox
#2232	Get rid of conditional catch clauses	Adblock-Plus-for-Firefox
#2192	Add notification opt-out mechanism	Core
#1602	Use ES6 generators instead of legacy generators	Adblock-Plus-for-Firefox

changes without issues:

​070ebe47b378	Added tag 2.6.9 for changeset 752ffe2eeaf1	Wladimir Palant
​9259df089273	Updated list of recommended subscriptions	hgbot
​ae1c96878402	Noissue - Remove unused isFennec property	Felix Dahlke
​556946c866e3	Noissue - Marked compatible with Firefox 41 & Co.	Wladimir Palant
​d089f66beaca	Noissue - Marked compatible with Firefox 42 & Co.	Wladimir Palant
​8116b6b3425f	Added tag 2.6.9.1-signed for changeset 752ffe2eeaf1	Wladimir Palant
​e89bf79b02a6	Added tag 2.6.9.1 for changeset 8116b6b3425f	Wladimir Palant
​494ff73924a7	Added tag 2.6.9.1 for changeset 752ffe2eeaf1	Wladimir Palant
​6ecc3e472a35	Updated list of recommended subscriptions	hgbot
​40bf96a06443	Noissue - Don't claim to support any Python 2.x version, we only test with Python 2.7	Wladimir Palant
​5434ef6e1545	Noissue - Fix syntax error in Firefox 41 (see bug 1176702)	Wladimir Palant

What to change

Update adblockplus dependency to hg:5434ef6e1545 revision as well as adapt the code.