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

content/public/common/content_switches.h

Index: content/public/common/content_switches.h
diff --git a/content/public/common/content_switches.h b/content/public/common/content_switches.h
index 1804588e0384b10dfd50db7a1f5b57efb70fad9d..fc93fc7763a7d5efd95b319a53e25fe2da4d49b7 100644
--- a/content/public/common/content_switches.h
+++ b/content/public/common/content_switches.h
@@ -50,6 +50,7 @@ CONTENT_EXPORT extern const char kDisableDelegatedRenderer[];
 extern const char kDisableDesktopNotifications[];
 extern const char kDisableDirectNPAPIRequests[];
 extern const char kDisableDomainBlockingFor3DAPIs[];
+CONTENT_EXPORT extern const char kDisableEmbeddedSharedWorker[];
 CONTENT_EXPORT extern const char kDisableExperimentalWebGL[];
 CONTENT_EXPORT extern const char kDisableFastTextAutosizing[];
 CONTENT_EXPORT extern const char kDisableFileSystem[];
@@ -117,7 +118,6 @@ CONTENT_EXPORT extern const char kEnableCompositingForTransition[];
 CONTENT_EXPORT extern const char kEnableDeferredImageDecoding[];
 CONTENT_EXPORT extern const char kEnableDelegatedRenderer[];
 CONTENT_EXPORT extern const char kEnableDownloadResumption[];
-CONTENT_EXPORT extern const char kEnableEmbeddedSharedWorker[];
 CONTENT_EXPORT extern const char kEnableEncryptedMedia[];
 CONTENT_EXPORT extern const char kEnableExperimentalCanvasFeatures[];
 CONTENT_EXPORT extern const char kEnableExperimentalWebPlatformFeatures[];