Convert JsonWriter::Write to taking a const ref for the in-param

ios/web/web_state/ui/crw_web_controller_observer_unittest.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.
 
 #import "ios/web/web_state/ui/crw_web_controller.h"
 
 #include <vector>
 
 #include "base/json/json_writer.h"
 #include "base/mac/scoped_nsobject.h"
@@ skipping 50 matching lines @@
 
 // Tests that web controller receives a JS message from the page.
 WEB_TEST_F(CRWUIWebViewWebControllerObserverTest,
            CRWWKWebViewWebControllerObserverTest,
            HandleCommand) {
   this->LoadHtml(@"<p></p>");
   ASSERT_EQ(0U, [this->fake_web_controller_observer_ commandsReceived].size());
   base::DictionaryValue command;
   command.SetString("command", "test.testMessage");
   std::string message;
-  base::JSONWriter::Write(&command, &message);
+  base::JSONWriter::Write(command, &message);
   this->RunJavaScript([NSString
       stringWithFormat:@"__gCrWeb.message.invokeOnHost(%s)", message.c_str()]);
   this->WaitForBackgroundTasks();
   ASSERT_EQ(1U, [this->fake_web_controller_observer_ commandsReceived].size());
   EXPECT_TRUE([this->fake_web_controller_observer_ commandsReceived][0]->Equals(
       &command));
 }
 
 // Tests that web controller receives an immediate JS message from the page.
 WEB_TEST_F(CRWUIWebViewWebControllerObserverTest,
            CRWWKWebViewWebControllerObserverTest,
            HandleImmediateCommand) {
   this->LoadHtml(@"<p></p>");
   ASSERT_NSNE(@"http://testimmediate#target",
               [this->webController_ externalRequestWindowName]);
   // The only valid immediate commands are window.unload and externalRequest.
   base::DictionaryValue command;
   command.SetString("command", "externalRequest");
   command.SetString("href", "http://testimmediate");
   command.SetString("target", "target");
   command.SetString("referrerPolicy", "referrerPolicy");
   std::string message;
-  base::JSONWriter::Write(&command, &message);
+  base::JSONWriter::Write(command, &message);
   this->RunJavaScript(
       [NSString stringWithFormat:@"__gCrWeb.message.invokeOnHostImmediate(%s)",
                                  message.c_str()]);
   this->WaitForBackgroundTasks();
   ASSERT_NSEQ(@"http://testimmediate#target",
               [this->webController_ externalRequestWindowName]);
 }
 
 // Send a large number of commands and check each one is immediately received.
 WEB_TEST_F(CRWUIWebViewWebControllerObserverTest,
            CRWWKWebViewWebControllerObserverTest,
            HandleMultipleCommands) {
   this->LoadHtml(@"<p></p>");
 
   base::DictionaryValue command;
   command.SetString("command", "test.testMessage");
   int kNumberMessages = 200;
   for (int count = 0; count <= kNumberMessages; count++) {
     std::string message;
     command.SetInteger("number", count);
-    base::JSONWriter::Write(&command, &message);
+    base::JSONWriter::Write(command, &message);
     ASSERT_EQ(0U,
               [this->fake_web_controller_observer_ commandsReceived].size());
     this->RunJavaScript(
         [NSString stringWithFormat:@"__gCrWeb.message.invokeOnHost(%s)",
                                    message.c_str()]);
     this->WaitForBackgroundTasks();
     ASSERT_EQ(1U,
               [this->fake_web_controller_observer_ commandsReceived].size());
     EXPECT_TRUE(
         [this->fake_web_controller_observer_ commandsReceived][0]->Equals(
             &command));
     [this->fake_web_controller_observer_ commandsReceived].clear();
     ASSERT_EQ(0U,
               [this->fake_web_controller_observer_ commandsReceived].size());
   }
 }
 
 }  // namespace