Bug 1565064 - remove obsolete pref from default files, r=emilio

Differential Revision: https://phabricator.services.mozilla.com/D37657

--HG--
extra : moz-landing-system : lando

browser/app/profile/firefox.js

@@ -1379,9 +1379,6 @@ pref("security.insecure_connection_text.pbmode.enabled", false);
 pref("security.cert_pinning.enforcement_level", 1);
 
 
-// Override the Gecko-default value of false for Firefox.
-pref("plain_text.wrap_long_lines", true);
-
 // If this turns true, Moz*Gesture events are not called stopPropagation()
 // before content.
 pref("dom.debug.propagate_gesture_events_through_content", false);

dom/base/test/reftest/reftest.list

@@ -4,4 +4,4 @@ HTTP == test_xmlPrettyPrint_csp.xml test_xmlPrettyPrint_csp-ref.xml
 # size of the reftest document. This test however needs something more representative
 # of a real mobile device, where the desktop viewport width doesn't match the
 # width of the device screen.
-test-pref(dom.meta-viewport.enabled,true) test-pref(browser.viewport.desktopWidth,1200) test-pref(plain_text.wrap_long_lines,true) == test_bug1525662.txt test_bug1525662-ref.html
+test-pref(dom.meta-viewport.enabled,true) test-pref(browser.viewport.desktopWidth,1200) == test_bug1525662.txt test_bug1525662-ref.html

mobile/android/app/mobile.js

@@ -366,9 +366,6 @@ pref("browser.ui.zoom.force-user-scalable", false);
 // With the typical screen sizes on mobile devices, we want to wrap page sources by default.
 pref("view_source.wrap_long_lines", true);
 
-// Ditto for plain text documents.
-pref("plain_text.wrap_long_lines", true);
-
 
 pref("ui.touch.radius.enabled", false);
 pref("ui.touch.radius.leftmm", 3);