DevTools/Coverage: fix decorations in HTML

third_party/WebKit/LayoutTests/inspector/coverage/gutter-js-expected.txt

 PASS
 
 Tests the coverage highlight in sources after the recording finishes.
 
 0: + function outer(index) {
-1: - 
+1:   
 2: -   function inner1(a) {
 3: -     return a + 1;
 4: -   }
-5: - 
+5:   
 6: +   function inner2(a) {
 7: +     return a + 2;
 8: +   }
-9: - 
+9:   
 10: +   function inner3(a) { return a + 3; } function inner4(a) { return a + 4; } function inner5(a) { return a + 5; }
-11: - 
+11:   
 12: +   return [inner1, inner2, inner3, inner4, inner5][index];
 13: + }
-14: - 
+14:   
 15: + function performActions() {
 16: +   return outer(1)(0) + outer(3)(0);
 17: + } function outer2() {
 18: -   return outer(0)(0);
 19: - }
-20: - 
+20: