[iOS] Upstream fork in template_url.cc

Use the same sourceid (chrome-mobile) for search on Google on Android and iOS.

BUG=None

Review URL: https://codereview.chromium.org/1134213002

Cr-Commit-Position: refs/heads/master@{#329618}

components/search_engines/template_url.cc

@@ -672,7 +672,7 @@ bool TemplateURLRef::ParseParameter(size_t start,
   } else if (parameter == kGoogleSessionToken) {
     replacements->push_back(Replacement(GOOGLE_SESSION_TOKEN, start));
   } else if (parameter == kGoogleSourceIdParameter) {
-#if defined(OS_ANDROID)
+#if defined(OS_ANDROID) || defined(OS_IOS)
     url->insert(start, "sourceid=chrome-mobile&");
 #else
     url->insert(start, "sourceid=chrome&");