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

chrome/browser/extensions/extension_messages_apitest.cc

Index: chrome/browser/extensions/extension_messages_apitest.cc
diff --git a/chrome/browser/extensions/extension_messages_apitest.cc b/chrome/browser/extensions/extension_messages_apitest.cc
index d727ada9fbef85bd7f26db918215bbe34b6ba730..cae566754409719c5a22e423d32be347735ba9f2 100644
--- a/chrome/browser/extensions/extension_messages_apitest.cc
+++ b/chrome/browser/extensions/extension_messages_apitest.cc
@@ -213,7 +213,7 @@ class ExternallyConnectableMessagingTest : public ExtensionApiTest {
   testing::AssertionResult AreAnyNonWebApisDefinedForFrame(
       content::RenderFrameHost* frame) {
     // All runtime API methods are non-web except for sendRequest and connect.
-    const char* non_messaging_apis[] = {
+    const char* const non_messaging_apis[] = {
         "getBackgroundPage",
         "getManifest",
         "getURL",
@@ -622,7 +622,7 @@ IN_PROC_BROWSER_TEST_F(ExternallyConnectableMessagingTest,
   // previously closed.
   tls_channel_id =
       GetTlsChannelIdFromPortConnect(chromium_connectable.get(), true);
-   // And the empty value is still retrieved.
+  // And the empty value is still retrieved.
   EXPECT_EQ(std::string(), tls_channel_id);
 }
 
@@ -987,7 +987,7 @@ IN_PROC_BROWSER_TEST_F(ExternallyConnectableMessagingWithTlsChannelIdTest,
   // previously closed.
   tls_channel_id =
       GetTlsChannelIdFromPortConnect(chromium_connectable.get(), true);
-   // And the expected value is still retrieved.
+  // And the expected value is still retrieved.
   EXPECT_EQ(expected_tls_channel_id_value, tls_channel_id);
 }