Add HttpHeaders constants for No-Vary-Search.

RELNOTES=`net`: Added `HttpHeaders` constants for `No-Vary-Search`.
PiperOrigin-RevId: 488976193

Author: java-team-github-bot

android/guava/src/com/google/common/net/HttpHeaders.java

@@ -316,6 +316,13 @@ private ReferrerPolicyValues() {}
    * @since 31.0
    */
   public static final String KEEP_ALIVE = "Keep-Alive";
+  /**
+   * The HTTP <a href="https://github.com/WICG/nav-speculation/blob/main/no-vary-search.md">{@code
+   * No-Vary-Seearch}</a> header field name.
+   *
+   * @since NEXT
+   */
+  public static final String NO_VARY_SEARCH = "No-Vary-Search";
   /**
    * The HTTP <a href="https://googlechrome.github.io/OriginTrials/#header">{@code Origin-Trial}</a>
    * header field name.

guava/src/com/google/common/net/HttpHeaders.java

@@ -316,6 +316,13 @@ private ReferrerPolicyValues() {}
    * @since 31.0
    */
   public static final String KEEP_ALIVE = "Keep-Alive";
+  /**
+   * The HTTP <a href="https://github.com/WICG/nav-speculation/blob/main/no-vary-search.md">{@code
+   * No-Vary-Seearch}</a> header field name.
+   *
+   * @since NEXT
+   */
+  public static final String NO_VARY_SEARCH = "No-Vary-Search";
   /**
    * The HTTP <a href="https://googlechrome.github.io/OriginTrials/#header">{@code Origin-Trial}</a>
    * header field name.