Merge 275988 "Move about://-related constants from //content to ..."

content/public/common/url_constants.h

Index: content/public/common/url_constants.h
===================================================================
--- content/public/common/url_constants.h	(revision 276109)
+++ content/public/common/url_constants.h	(working copy)
@@ -15,7 +15,6 @@
 // Canonical schemes you can use as input to GURL.SchemeIs().
 // 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 kChromeDevToolsScheme[];
 CONTENT_EXPORT extern const char kChromeUIScheme[];  // Used for WebUIs.
 CONTENT_EXPORT extern const char kGuestScheme[];
@@ -24,7 +23,6 @@
 CONTENT_EXPORT extern const char kViewSourceScheme[];
 
 // Hosts for about URLs.
-CONTENT_EXPORT extern const char kAboutBlankURL[];
 CONTENT_EXPORT extern const char kAboutSrcDocURL[];
 
 CONTENT_EXPORT extern const char kChromeUIAccessibilityHost[];