Expose IsDefaultSearchProvider and SetDefaultSearchProvider by default on Windows.

chrome/renderer/external_extension.cc

Index: chrome/renderer/external_extension.cc
diff --git a/chrome/renderer/external_extension.cc b/chrome/renderer/external_extension.cc
index a34b6a494c60960ec1b6fed27adf072940cd49dd..60d97773198f8a729497c47403361091e8664c46 100644
--- a/chrome/renderer/external_extension.cc
+++ b/chrome/renderer/external_extension.cc
@@ -46,8 +46,12 @@ const char* const kExternalExtensionName = "v8/External";
 // with an extra parameter to indicate if the provider should be the default"
 // be available?
 static bool EnableSearchProviderV2() {
+#if defined(OS_WIN)
+  return true;
+#else
   return CommandLine::ForCurrentProcess()->HasSwitch(
       switches::kEnableSearchProviderApiV2);
+#endif
 }
 
 class ExternalExtensionWrapper : public v8::Extension {