Update ICU to 58.1

third_party/WebKit/LayoutTests/platform/mac/fast/text/midword-break-before-surrogate-pair-expected.txt

 layer at (0,0) size 800x600
   LayoutView at (0,0) size 800x600
 layer at (0,0) size 800x600
   LayoutBlockFlow {HTML} at (0,0) size 800x600
     LayoutBlockFlow {BODY} at (8,8) size 784x584
       LayoutBlockFlow {P} at (0,0) size 784x36
         LayoutText {#text} at (0,0) size 764x36
           text run at (0,0) width 764: "The following box should break the sequence of symbols at the 5 character mark and not overflow the blue box. This is"
-          text run at (0,18) width 253: "because U+1D49 is a number category "
-          text run at (252,18) width 298: "unicode character, for which break-all applies."
+          text run at (0,18) width 540: "because U+1D49E has a general category(gC) of Letter, for which break-all applies."
       LayoutBlockFlow {DIV} at (0,52) size 186x104 [border: (3px solid #0000FF)]
         LayoutText {#text} at (3,3) size 173x98
           text run at (3,3) width 173: "\x{D835}\x{DC9E}\x{D835}\x{DC9E}\x{D835}\x{DC9E}\x{D835}\x{DC9E}\x{D835}\x{DC9E}\x{D835}\x{DC9E}\x{D835}\x{DC9E}"
           text run at (3,52) width 74: "\x{D835}\x{DC9E}\x{D835}\x{DC9E}\x{D835}\x{DC9E}"
-      LayoutBlockFlow {P} at (0,172) size 784x18
-        LayoutText {#text} at (0,0) size 778x18
-          text run at (0,0) width 539: "The following box should not break the sequence of symbols since U+1F1EF is not "
-          text run at (538,0) width 240: "a letter or number category character."
-      LayoutBlockFlow {DIV} at (0,206) size 186x55 [border: (3px solid #0000FF)]
-        LayoutText {#text} at (3,3) size 576x49
-          text run at (3,3) width 576: "\x{D83C}\x{DDEF}\x{D83C}\x{DDF5}\x{D83C}\x{DDEF}\x{D83C}\x{DDF5}\x{D83C}\x{DDEF}\x{D83C}\x{DDF5}\x{D83C}\x{DDEF}\x{D83C}\x{DDF5}\x{D83C}\x{DDEF}\x{D83C}\x{DDF5}\x{D83C}\x{DDEF}\x{D83C}\x{DDF5}\x{D83C}\x{DDEF}\x{D83C}\x{DDF5}\x{D83C}\x{DDEF}\x{D83C}\x{DDF5}"
+      LayoutBlockFlow {P} at (0,172) size 784x36
+        LayoutText {#text} at (0,0) size 778x36
+          text run at (0,0) width 778: "The following box should break between a pair of regional indicators ( U+1F1EF and U+1F1F5 ) because they (as a pair)"
+          text run at (0,18) width 444: "act like Ideographs (LB=ID) whether or not 'word-break' is break-all."
+      LayoutBlockFlow {DIV} at (0,224) size 186x202 [border: (3px solid #0000FF)]
+        LayoutText {#text} at (3,3) size 144x196
+          text run at (3,3) width 144: "\x{D83C}\x{DDEF}\x{D83C}\x{DDF5}\x{D83C}\x{DDEF}\x{D83C}\x{DDF5}"
+          text run at (3,52) width 144: "\x{D83C}\x{DDEF}\x{D83C}\x{DDF5}\x{D83C}\x{DDEF}\x{D83C}\x{DDF5}"
+          text run at (3,101) width 144: "\x{D83C}\x{DDEF}\x{D83C}\x{DDF5}\x{D83C}\x{DDEF}\x{D83C}\x{DDF5}"
+          text run at (3,150) width 144: "\x{D83C}\x{DDEF}\x{D83C}\x{DDF5}\x{D83C}\x{DDEF}\x{D83C}\x{DDF5}"