[ios] Do not JSON encode messages sent from WebView to native code.

components/translate/ios/browser/language_detection_controller.mm

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/translate/ios/browser/language_detection_controller.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/logging.h"
@@ skipping 69 matching lines @@
   if (!translation_allowed) {
     // Translation not allowed by the page. Done processing.
     return true;
   }
   if (!command.HasKey("captureTextTime") || !command.HasKey("htmlLang") ||
       !command.HasKey("httpContentLanguage")) {
     NOTREACHED();
     return false;
   }
 
-  int capture_text_time = 0;
-  command.GetInteger("captureTextTime", &capture_text_time);
+  double capture_text_time = 0;
+  command.GetDouble("captureTextTime", &capture_text_time);
   UMA_HISTOGRAM_TIMES(kTranslateCaptureText,
                       base::TimeDelta::FromMillisecondsD(capture_text_time));
   std::string html_lang;
   command.GetString("htmlLang", &html_lang);
   std::string http_content_language;
   command.GetString("httpContentLanguage", &http_content_language);
   // If there is no language defined in httpEquiv, use the HTTP header.
   if (http_content_language.empty())
     http_content_language = web_state()->GetContentLanguageHeader();
 
@@ skipping 37 matching lines @@
 
 void LanguageDetectionController::HistoryStateChanged() {
   StartLanguageDetection();
 }
 
 void LanguageDetectionController::WebStateDestroyed() {
   web_state()->RemoveScriptCommandCallback(kCommandPrefix);
 }
 
 }  // namespace translate