diff -r 4ff3f9d83fe5 -r f15d443f9731 src/jdk.compiler/share/classes/com/sun/tools/javac/resources/compiler.properties
--- a/src/jdk.compiler/share/classes/com/sun/tools/javac/resources/compiler.properties	Wed Jan 09 15:36:20 2019 +0100
+++ b/src/jdk.compiler/share/classes/com/sun/tools/javac/resources/compiler.properties	Wed Jan 09 11:13:00 2019 -0400
@@ -1240,9 +1240,6 @@
 compiler.err.unclosed.str.lit=\
     unclosed string literal
 
-compiler.err.unicode.backtick=\
-    attempt to use \\u0060 as a raw string literal delimiter
-
 # 0: string
 compiler.err.unsupported.encoding=\
     unsupported encoding: {0}
@@ -2837,9 +2834,6 @@
 compiler.misc.feature.switch.expressions=\
     switch expressions
 
-compiler.misc.feature.raw.string.literals=\
-    raw string literals
-
 compiler.misc.feature.var.syntax.in.implicit.lambda=\
     var syntax in implicit lambdas