Deprecate cache_expression_exact_match

components/safe_browsing/csd.proto

Index: components/safe_browsing/csd.proto
diff --git a/components/safe_browsing/csd.proto b/components/safe_browsing/csd.proto
index 04316444ad1f5cee083f23767842394f203f5f9a..023abe4ffbd71d545a9f2e78426397463fdd8dd8 100644
--- a/components/safe_browsing/csd.proto
+++ b/components/safe_browsing/csd.proto
@@ -248,19 +248,8 @@ message LoginReputationClientResponse {
   // a substring of page_url.
   optional string cache_expression = 3;
 
-  // If set true, we match target URL with cache expression up to both of their
-  // last /'s.
-  //
-  // Examples:
-  //    If set true, a cache_expression "foo.com/bar" will match
-  //      "foo.com/bar",
-  //      "foo.com/bar/bar.cgi",
-  //      "foo.com/bar/login.html?param=val",
-  //    but will NOT match
-  //      "foo.com",
-  //      "foo.com/abc/",
-  //      "foo.com/bar/abc/edf.cgi"
-  optional bool cache_expression_exact_match = 4;
+  // Deprecated.
+  optional bool DEPRECATED_cache_expression_exact_match = 4 [deprecated = true];
 }
 
 message ClientMalwareResponse {