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

chrome/browser/extensions/extension_nacl_browsertest.cc

Index: chrome/browser/extensions/extension_nacl_browsertest.cc
diff --git a/chrome/browser/extensions/extension_nacl_browsertest.cc b/chrome/browser/extensions/extension_nacl_browsertest.cc
index 4cdcf8ded2e0772e549c80b6924b309d9f03e801..7bbc42215fd1d5fe4b0b580136e4eeeb7f85f189 100644
--- a/chrome/browser/extensions/extension_nacl_browsertest.cc
+++ b/chrome/browser/extensions/extension_nacl_browsertest.cc
@@ -31,7 +31,7 @@ using extensions::Manifest;
 
 namespace {
 
-const char* kExtensionId = "bjjcibdiodkkeanflmiijlcfieiemced";
+const char kExtensionId[] = "bjjcibdiodkkeanflmiijlcfieiemced";
 
 // This class tests that the Native Client plugin is blocked unless the
 // .nexe is part of an extension from the Chrome Webstore.
@@ -143,7 +143,6 @@ class NaClExtensionTest : public ExtensionBrowserTest {
     CheckPluginsCreated(extension->GetResourceURL("test.html"),
                         expected_to_succeed);
   }
-
 };
 
 // Test that the NaCl plugin isn't blocked for Webstore extensions.