deps: cherry-pick 2987946 from upstream V8

Original commit message: Stop manual unescaping of script source data when preprocessing logs. It appears that the fields are already being unescaped elsewhere, perhaps by the JSON writer. So if we unescape when adding the source filename and contents, unescaping will happen again later and plain backslashes will be interpreted as escape codes. Bug: v8:6240 Change-Id: Ic66b9017ae685d6dd12944ee8d254991e26fbd32 Reviewed-on: https://chromium-review.googlesource.com/1186625 Reviewed-by: Jaroslav Sevcik <jarin@chromium.org> Commit-Queue: Bret Sepulveda <bsep@chromium.org> Cr-Commit-Position: refs/heads/master@{#55401} Refs: v8/v8@2987946 PR-URL: #24555 Fixes: #20891 Reviewed-By: Richard Lau <riclau@uk.ibm.com> Reviewed-By: Bartosz Sosnowski <bartosz@janeasystems.com>

Author: refack

common.gypi

@@ -30,7 +30,7 @@
 
  # Reset this number to 0 on major V8 upgrades.
  # Increment by one for each non-official patch applied to deps/v8.
- 'v8_embedder_string': '-node.45',
+ 'v8_embedder_string': '-node.46',
 
  # Enable disassembler for `--print-code` v8 options
  'v8_enable_disassembler': 1,

deps/v8/tools/profile.js

@@ -1002,33 +1002,10 @@ JsonProfile.prototype.addSourcePositions = function(
  };
 };
 
-function unescapeString(s) {
- s = s.split("\\");
- for (var i = 1; i < s.length; i++) {
- if (s[i] === "") {
- // Double backslash.
- s[i] = "\\";
- } else if (i > 0 && s[i].startsWith("x")) {
- // Escaped Ascii character.
- s[i] = String.fromCharCode(parseInt(s[i].substring(1, 3), 16)) +
- s[i].substring(3);
- } else if (i > 0 && s[i].startsWith("u")) {
- // Escaped unicode character.
- s[i] = String.fromCharCode(parseInt(s[i].substring(1, 5), 16)) +
- s[i].substring(5);
- } else {
- if (i > 0 && s[i - 1] !== "\\") {
- printErr("Malformed source string");
- }
- }
- }
- return s.join("");
-}
-
 JsonProfile.prototype.addScriptSource = function(script, url, source) {
  this.scripts_[script] = {
- name : unescapeString(url),
- source : unescapeString(source)
+ name : url,
+ source : source
  };
 };