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

components/translate/ios/browser/language_detection_controller.mm

Index: components/translate/ios/browser/language_detection_controller.mm
diff --git a/components/translate/ios/browser/language_detection_controller.mm b/components/translate/ios/browser/language_detection_controller.mm
index ed82a83c1fec8990a395bddb249fff1635282c0f..14c6800494f77d9f4e2e0d2af1762eaa7a2632ad 100644
--- a/components/translate/ios/browser/language_detection_controller.mm
+++ b/components/translate/ios/browser/language_detection_controller.mm
@@ -87,8 +87,8 @@ bool LanguageDetectionController::OnTextCaptured(
     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;