Add ExecuteJavaScriptForTest and make all tests use it

extensions/browser/api/system_storage/system_storage_eject_apitest.cc

 // Copyright 2013 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.
 //
 // SystemStorage eject API browser tests.
 
 #include "base/files/file_path.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "components/storage_monitor/storage_info.h"
@@ skipping 40 matching lines @@
 
     return extensions::ProcessManager::Get(browser_context())
         ->GetBackgroundHostForExtension(extension->id())
         ->render_view_host();
   }
 
   void ExecuteCmdAndCheckReply(content::RenderViewHost* host,
                                const std::string& js_command,
                                const std::string& ok_message) {
     ExtensionTestMessageListener listener(ok_message, false);
-    host->GetMainFrame()->ExecuteJavaScript(base::ASCIIToUTF16(js_command));
+    host->GetMainFrame()->ExecuteJavaScriptForTests(
+        base::ASCIIToUTF16(js_command));
     EXPECT_TRUE(listener.WaitUntilSatisfied());
   }
 
   void Attach() {
     DCHECK(StorageMonitor::GetInstance()->IsInitialized());
     StorageMonitor::GetInstance()->receiver()->ProcessAttach(
         extensions::test::BuildStorageInfoFromTestStorageUnitInfo(
             kRemovableStorageData));
     content::RunAllPendingInMessageLoop();
   }
@@ skipping 28 matching lines @@
   EXPECT_EQ(kRemovableStorageData.device_id, monitor_->ejected_device());
 
   Detach();
 }
 
 IN_PROC_BROWSER_TEST_F(SystemStorageEjectApiTest, EjectBadDeviceTest) {
   ExecuteCmdAndCheckReply(GetHost(), "ejectFailTest()", "eject_no_such_device");
 
   EXPECT_EQ("", monitor_->ejected_device());
 }