[Addressinput] Assign getSortKey() return value

Assigned return value of getSortKey() to sort_key_size variable as it was before.
related patch: https://chromium-review.googlesource.com/c/chromium/src/+/1592677

Bug: 1056603
Change-Id: I979ef2416fcc428546148f6a7874ab61d9269b34
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2078014Reviewed-by: Rouslan Solomakhin <rouslan@chromium.org>
Reviewed-by: Parastoo Geranmayeh <parastoog@google.com>
Commit-Queue: Parastoo Geranmayeh <parastoog@google.com>
Cr-Commit-Position: refs/heads/master@{#745124}

third_party/libaddressinput/chromium/input_suggester.cc

@@ -259,7 +259,7 @@ const std::vector<uint8_t>& InputSuggester::StringCanonicalizer::Canonicalize(
                              static_cast<int32_t>(original.length()));
   int32_t sort_key_size = 0;
   if (collator_)
-    collator_->getSortKey(icu_str, &buffer_[0], buffer_size());
+    sort_key_size = collator_->getSortKey(icu_str, &buffer_[0], buffer_size());
   DCHECK_LT(0, sort_key_size);
 
   if (sort_key_size > buffer_size()) {