Change break_iterator object to smart pointer to prevent memory leaks

- Encountered Memory leak while running Asan build.
- Leak Sanitizer stack trace debugged.

Change-Id: I8735a01bfe6aa17066bd7fd5230f624bbb4fe8ee
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6433766
Reviewed-by: Kent Tamura <tkent@chromium.org>
Commit-Queue: Koji Ishii <kojii@chromium.org>
Reviewed-by: Koji Ishii <kojii@chromium.org>
Auto-Submit: Nishaanth Shriram M S <nishaanthshriramms@gmail.com>
Cr-Commit-Position: refs/heads/main@{#1442900}

AUTHORS

@@ -1086,6 +1086,7 @@ Nikola Kovacs <nikola.kovacs@gmail.com>
 Nils Schneider <nils.schneider@gmail.com>
 Nils Schneider <nils@nilsschneider.net>
 Ningxin Hu <ningxin.hu@intel.com>
+Nishaanth Shriram M S <nishaanthshriramms@gmail.com>
 Nitish Mehrotra <nitish.m@samsung.com>
 Nivedan Sharma <ni.sharma@samsung.com>
 Noam Rosenthal <noam.j.rosenthal@gmail.com>

third_party/blink/renderer/platform/text/character_property_data_generator.cc

@@ -310,8 +310,8 @@ class LineBreakData {
   void FillFromIcu() {
     UErrorCode status = U_ZERO_ERROR;
     const icu::Locale locale("en");
-    icu::BreakIterator* break_iterator =
-        icu::BreakIterator::createLineInstance(locale, status);
+    std::unique_ptr<icu::BreakIterator> break_iterator(
+        icu::BreakIterator::createLineInstance(locale, status));
     CHECK_U_ERROR(status, "createLineInstance");
 
     for (UChar ch = kMinChar; ch <= kMaxChar; ++ch) {