DevTools: remove nesting depth tracking from coverage

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

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