Turn on better popup blocker by default.

chrome/common/chrome_switches.h

Index: chrome/common/chrome_switches.h
diff --git a/chrome/common/chrome_switches.h b/chrome/common/chrome_switches.h
index 5b36cf642d3b183b17f0fdd1d427078dac001f91..9d1a66a0578f5480b7858b4b21fed9d9ac5ff5c5 100644
--- a/chrome/common/chrome_switches.h
+++ b/chrome/common/chrome_switches.h
@@ -85,6 +85,7 @@ extern const char kDisableAsyncDns[];
 extern const char kDisableAuthNegotiateCnameLookup[];
 extern const char kDisableBackgroundMode[];
 extern const char kDisableBackgroundNetworking[];
+extern const char kDisableBetterPopupBlocking[];
 extern const char kDisableBundledPpapiFlash[];
 extern const char kDisableBookmarkAutocompleteProvider[];
 extern const char kDisableClientSidePhishingDetection[];
@@ -150,7 +151,6 @@ extern const char kEnableAsyncDns[];
 extern const char kEnableAuthNegotiatePort[];
 extern const char kEnableAutologin[];
 extern const char kEnableBenchmarking[];
-extern const char kEnableBetterPopupBlocking[];
 extern const char kEnableBookmarkSyncPromo[];
 extern const char kEnableCloudPrintProxy[];
 extern const char kEnableComponentCloudPolicy[];