Convert spellcheck to a buildflag header.

chrome/browser/spellchecker/spellcheck_message_filter_unittest.cc

Index: chrome/browser/spellchecker/spellcheck_message_filter_unittest.cc
diff --git a/chrome/browser/spellchecker/spellcheck_message_filter_unittest.cc b/chrome/browser/spellchecker/spellcheck_message_filter_unittest.cc
index ad933ea254238d13d46a32fc32951bce40471747..7781c26b44c7a8deb521accc9843333f2dd28501 100644
--- a/chrome/browser/spellchecker/spellcheck_message_filter_unittest.cc
+++ b/chrome/browser/spellchecker/spellcheck_message_filter_unittest.cc
@@ -15,6 +15,7 @@
 #include "chrome/test/base/testing_profile.h"
 #include "components/spellcheck/common/spellcheck_marker.h"
 #include "components/spellcheck/common/spellcheck_messages.h"
+#include "components/spellcheck/spellcheck_build_features.h"
 #include "content/public/test/test_browser_thread_bundle.h"
 #include "ipc/ipc_message.h"
 #include "testing/gtest/include/gtest/gtest.h"
@@ -34,7 +35,7 @@ class TestingSpellCheckMessageFilter : public SpellCheckMessageFilter {
     return spellcheck_.get();
   }
 
-#if !defined(USE_BROWSER_SPELLCHECKER)
+#if !BUILDFLAG(USE_BROWSER_SPELLCHECKER)
   void OnTextCheckComplete(int route_id,
                            int identifier,
                            const std::vector<SpellCheckMarker>& markers,
@@ -63,7 +64,7 @@ TEST(SpellCheckMessageFilterTest, TestOverrideThread) {
     SpellCheckHostMsg_RequestDictionary::ID,
     SpellCheckHostMsg_NotifyChecked::ID,
     SpellCheckHostMsg_RespondDocumentMarkers::ID,
-#if !defined(USE_BROWSER_SPELLCHECKER)
+#if !BUILDFLAG(USE_BROWSER_SPELLCHECKER)
     SpellCheckHostMsg_CallSpellingService::ID,
 #endif
   };
@@ -80,7 +81,7 @@ TEST(SpellCheckMessageFilterTest, TestOverrideThread) {
   }
 }
 
-#if !defined(USE_BROWSER_SPELLCHECKER)
+#if !BUILDFLAG(USE_BROWSER_SPELLCHECKER)
 TEST(SpellCheckMessageFilterTest, OnTextCheckCompleteTestCustomDictionary) {
   static const std::string kCustomWord = "Helllo";
   static const int kRouteId = 0;