Cleanup: Better constify some strings in chrome/browser/{chromeos,extensions}.

chrome/browser/extensions/extension_loading_browsertest.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.
 //
 // This file contains tests for extension loading, reloading, and
 // unloading behavior.
 
 #include "base/run_loop.h"
 #include "base/strings/stringprintf.h"
 #include "base/version.h"
@@ skipping 14 matching lines @@
 };
 
 // Check the fix for http://crbug.com/178542.
 IN_PROC_BROWSER_TEST_F(ExtensionLoadingTest,
                        UpgradeAfterNavigatingFromOverriddenNewTabPage) {
   embedded_test_server()->ServeFilesFromDirectory(
       base::FilePath(FILE_PATH_LITERAL("chrome/test/data")));
   ASSERT_TRUE(embedded_test_server()->InitializeAndWaitUntilReady());
 
   TestExtensionDir extension_dir;
-  const char* manifest_template =
+  const char manifest_template[] =
       "{"
       "  \"name\": \"Overrides New Tab\","
       "  \"version\": \"%d\","
       "  \"description\": \"Overrides New Tab\","
       "  \"manifest_version\": 2,"
       "  \"background\": {"
       "    \"persistent\": false,"
       "    \"scripts\": [\"event.js\"]"
       "  },"
       "  \"chrome_url_overrides\": {"
@@ skipping 37 matching lines @@
                 ui::PAGE_TRANSITION_TYPED);
 
   // Check that the extension hasn't crashed.
   ExtensionRegistry* registry = ExtensionRegistry::Get(profile());
   EXPECT_EQ(0U, registry->terminated_extensions().size());
   EXPECT_TRUE(registry->enabled_extensions().Contains(new_tab_extension->id()));
 }
 
 }  // namespace
 }  // namespace extensions