content: Move more constants from url_constants.h into content namespace.

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 8961b20a73d0aa33b8296b7a970734d13d85ff9b..ece09e65c764fc395c730318594aab6940cb0903 100644
--- a/content/public/common/url_constants.h
+++ b/content/public/common/url_constants.h
@@ -51,6 +51,10 @@ CONTENT_EXPORT extern const char kChromeUITcmallocHost[];
 CONTENT_EXPORT extern const char kChromeUITracingHost[];
 CONTENT_EXPORT extern const char kChromeUIWebRTCInternalsHost[];
 
+}  // namespace chrome
+
+namespace content {
+
 // Full about URLs (including schemes).
 CONTENT_EXPORT extern const char kChromeUICrashURL[];
 CONTENT_EXPORT extern const char kChromeUIGpuCleanURL[];
@@ -61,10 +65,6 @@ CONTENT_EXPORT extern const char kChromeUIKillURL[];
 CONTENT_EXPORT extern const char kChromeUIPpapiFlashCrashURL[];
 CONTENT_EXPORT extern const char kChromeUIPpapiFlashHangURL[];
 
-}  // namespace chrome
-
-namespace content {
-
 // Used to separate a standard scheme and the hostname: "://".
 CONTENT_EXPORT extern const char kStandardSchemeSeparator[];