Removed partial Client Hints implementation from the Chrome side.

chrome/common/chrome_switches.cc

Index: chrome/common/chrome_switches.cc
diff --git a/chrome/common/chrome_switches.cc b/chrome/common/chrome_switches.cc
index dcf4a253f2e2055e5f66f206d23e71d33658d461..38f430bbf90831fd4e13512bdc4826c2e62c5e39 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -398,9 +398,6 @@ const char kEnableAsyncDns[]                = "enable-async-dns";
 // Enables the benchmarking extensions.
 const char kEnableBenchmarking[]            = "enable-benchmarking";
 
-// Enables client hints, which adds hints about browser state to HTTP requests.
-const char kEnableClientHints[]             = "enable-client-hints";
-
 // Enables the multi-level undo system for bookmarks.
 const char kEnableBookmarkUndo[]            = "enable-bookmark-undo";