Revert "Issue #1869548 by dawehner, jeqq, dmouse, damiankloip, nod_, AlxVallejo, chr.fritsch, yanniboi, effulgentsia, dixon_, -enzo-, Wim Leers, Crell, Damien Tournoud, andypost, kim.pepper, linclark, catch: Opt-in CORS support"

This reverts commit f2b71152.

Issue #88183 by Wim Leers, ahoeben, brianV, alexpott, kylebrowning, marvil07, chx, twistor, dawehner: Relative URLs in feeds should be converted to absolute ones

Revert "Issue #2278383 by Xano, dawehner, kim.pepper, twistor, joelpittet, Fabianx, Crell, jibran, alexpott, Wim Leers: Create an injectible service for drupal_set_message()"

This reverts commit ee222725.

Issue #2659070 by Wim Leers, dawehner, tic2000, Crell: REST requests without Content-Type header: unhelpful response significantly hinders DX, should receive a 415 response

Issue #2694555 by amateescu, vasi, dawehner, heddn, therealssj: Node revisions don't display translated

Issue #2278383 by Xano, dawehner, kim.pepper, twistor, joelpittet, Fabianx, Crell, jibran, alexpott, Wim Leers: Create an injectible service for drupal_set_message()

Revert "Issue #2403307 by dawehner, marthinal, tedbow, clemens.tolboom, Wim Leers, neclimdul, Crell, klausi, andypost, e0ipso: RPC endpoints for user authentication: log in, check login status, log out"

This reverts commit 18feefc3.

Issue #2403307 by dawehner, marthinal, tedbow, clemens.tolboom, Wim Leers, neclimdul, Crell, klausi, andypost, e0ipso: RPC endpoints for user authentication: log in, check login status, log out

Issue #2763157 by tim.plunkett, tedbow, chx, bojanz, twistor, neclimdul, dawehner, Xano, EclipseGc: Allow plugins to provide multiple forms

Revert "Issue #2773197 by jalpesh, tstoeckler: DefaultHtmlRouteProviderTest::testGetCollectionRoute() has wrong @covers"

This reverts commit a470bc0c.

Issue #2773197 by jalpesh, tstoeckler: DefaultHtmlRouteProviderTest::testGetCollectionRoute() has wrong @covers

Issue #1869548 by dawehner, jeqq, dmouse, damiankloip, nod_, AlxVallejo, chr.fritsch, yanniboi, effulgentsia, dixon_, -enzo-, Wim Leers, Crell, Damien Tournoud, andypost, kim.pepper, linclark, catch: Opt-in CORS support

Issue #2753681 by tedbow, Wim Leers, dawehner, neclimdul, catch: Move CSRF header token out of REST module so that user module can use it, as well as any contrib module

This reverts commit 4a95e650.

Issue #2754003 by Berdir, Wim Leers: Move more cache items from the default to the bootstrap or discovery bin

Issue #2663270 by Berdir, marthinal, Wim Leers: MailManager::mail() should run inside its own render context: it sends e-mails, not (cacheable) responses

Issue #2726645 by klausi: Do not @deprecate EntityManager until all usages are removed (helps the Symfony 3 update)

Issue #2380293 revert by dawehner, willzyx, mpdonadio, jibran, alexpott, damiankloip, cilefen, Berdir: Properly inject services into ModuleInstaller

Issue #2380293 by dawehner, willzyx, jibran, mpdonadio, alexpott, damiankloip, cilefen, Berdir: Properly inject services into ModuleInstaller

Issue #2699627 by catch, dawehner, Wim Leers: url.path cache context for breadcrumbs is unnecessarily granular

Issue #2589967 by alexpott, dawehner, damiankloip, valthebald: Rebuild routes immediately when modules are installed

Issue #2696669 by mbovan, Berdir, sanja_m: Incomplete/broken access checking in EntityController::addPage()

Issue #2688668 by Berdir, bojanz: Register the new entity revision param enhancer/converter as services

Revert "Issue #2688668 by Berdir, bojanz: Register the new entity revision param enhancer/converter as services"

This reverts commit fff38959.

Issue #2688668 by Berdir, bojanz: Register the new entity revision param enhancer/converter as services

Issue #2678674 by Wim Leers, benjy, mr.baileys, dawehner, xjm, mlhess: Access bypass to unpublished custom error pages

Issue #2611816 by dawehner, jibran, catch, hussainweb, Ankit Agrawal, neclimdul: Update to symfony 2.8 (follow-up for invalid YAML)

Issue #2595695 by Wim Leers, alexpott, mfb, Crell, cilefen, dawehner: 4xx handling using subrequests: no longer able to vary by URL

Issue #2337191 by tim.plunkett, dawehner, jibran, yched, Wim Leers, catch: Split up EntityManager into many services

Issue #2575735 by almaudoh: LibraryDiscoveryCollector::reset() does not properly reset its $cid, resulting in loading wrong library assets if the active theme changes

Issue #2527126 by Wim Leers, dawehner, effulgentsia, anavarre, janusman, Fabianx, alexpott, hass, catch, Berdir, znerol: Only send X-Drupal-Cache-Tags and -Contexts headers when developer explicitly enables them