Reverse the embedded-shared-worker flag to turn the feature on by default.

content/public/common/content_switches.cc

Index: content/public/common/content_switches.cc
diff --git a/content/public/common/content_switches.cc b/content/public/common/content_switches.cc
index 2036b705da00bb48e1da071f7415c3f2d882ac08..9c99fb3a47da0a806b5828e14fe20df06ee416b6 100644
--- a/content/public/common/content_switches.cc
+++ b/content/public/common/content_switches.cc
@@ -144,6 +144,9 @@ const char kDisableDirectNPAPIRequests[]    = "disable-direct-npapi-requests";
 extern const char kDisableDomainBlockingFor3DAPIs[] =
     "disable-domain-blocking-for-3d-apis";
 
+// Disable running the SharedWorker inside the renderer process.
+const char kDisableEmbeddedSharedWorker[]    = "disable-embedded-shared-worker";
+
 // Disable experimental WebGL support.
 const char kDisableExperimentalWebGL[]      = "disable-webgl";
 
@@ -394,9 +397,6 @@ const char kEnableDelegatedRenderer[]       = "enable-delegated-renderer";
 // Enables restarting interrupted downloads.
 const char kEnableDownloadResumption[]      = "enable-download-resumption";
 
-// Enables running the SharedWorker inside the renderer process.
-const char kEnableEmbeddedSharedWorker[]    = "enable-embedded-shared-worker";
-
 // Enables support for Encrypted Media Extensions (e.g. MediaKeys).
 const char kEnableEncryptedMedia[] = "enable-encrypted-media";