Move some content url constants to /url.

content/public/common/url_constants.h

Index: content/public/common/url_constants.h
diff --git a/content/public/common/url_constants.h b/content/public/common/url_constants.h
index f2f70786295ac42221cc89130fb73a2b31ae9d3c..a544377b6a59a126ff87750f34ad6ce8d8b00736 100644
--- a/content/public/common/url_constants.h
+++ b/content/public/common/url_constants.h
@@ -16,16 +16,9 @@ namespace content {
 // TODO(jam): some of these don't below in the content layer, but are accessed
 // from there.
 CONTENT_EXPORT extern const char kAboutScheme[];
-CONTENT_EXPORT extern const char kBlobScheme[];
 CONTENT_EXPORT extern const char kChromeDevToolsScheme[];
 CONTENT_EXPORT extern const char kChromeUIScheme[];  // Used for WebUIs.
-CONTENT_EXPORT extern const char kDataScheme[];
-CONTENT_EXPORT extern const char kFileScheme[];
-CONTENT_EXPORT extern const char kFileSystemScheme[];
-CONTENT_EXPORT extern const char kFtpScheme[];
 CONTENT_EXPORT extern const char kGuestScheme[];
-CONTENT_EXPORT extern const char kJavaScriptScheme[];
-CONTENT_EXPORT extern const char kMailToScheme[];
 CONTENT_EXPORT extern const char kMetadataScheme[];
 CONTENT_EXPORT extern const char kSwappedOutScheme[];
 CONTENT_EXPORT extern const char kViewSourceScheme[];