Withdraw various unreleased HttpHeaders constants related to https://github.com/WICG/signature-based-sri.

RELNOTES=Withdrew various unreleased `HttpHeaders` constants related to https://github.com/WICG/signature-based-sri. Really, this release note is just here to remind us not to include the original release note about _adding_ those constants :)
PiperOrigin-RevId: 741263763

Author: java-team-github-bot

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

@@ -71,13 +71,6 @@ private HttpHeaders() {}
   /** The HTTP {@code Accept-Language} header field name. */
   public static final String ACCEPT_LANGUAGE = "Accept-Language";
 
-  /**
-   * The HTTP {@code Accept-Signature} header field name.
-   *
-   * @since NEXT
-   */
-  public static final String ACCEPT_SIGNATURE = "Accept-Signature";
-
   /** The HTTP {@code Access-Control-Request-Headers} header field name. */
   public static final String ACCESS_CONTROL_REQUEST_HEADERS = "Access-Control-Request-Headers";
 
@@ -452,20 +445,6 @@ private ReferrerPolicyValues() {}
   /** The HTTP {@code Set-Cookie2} header field name. */
   public static final String SET_COOKIE2 = "Set-Cookie2";
 
-  /**
-   * The HTTP {@code Signature} header field name.
-   *
-   * @since NEXT
-   */
-  public static final String SIGNATURE = "Signature";
-
-  /**
-   * The HTTP {@code Signature-Input} header field name.
-   *
-   * @since NEXT
-   */
-  public static final String SIGNATURE_INPUT = "Signature-Input";
-
   /**
    * The HTTP <a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/SourceMap">{@code
    * SourceMap}</a> header field name.

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

@@ -71,13 +71,6 @@ private HttpHeaders() {}
   /** The HTTP {@code Accept-Language} header field name. */
   public static final String ACCEPT_LANGUAGE = "Accept-Language";
 
-  /**
-   * The HTTP {@code Accept-Signature} header field name.
-   *
-   * @since NEXT
-   */
-  public static final String ACCEPT_SIGNATURE = "Accept-Signature";
-
   /** The HTTP {@code Access-Control-Request-Headers} header field name. */
   public static final String ACCESS_CONTROL_REQUEST_HEADERS = "Access-Control-Request-Headers";
 
@@ -452,20 +445,6 @@ private ReferrerPolicyValues() {}
   /** The HTTP {@code Set-Cookie2} header field name. */
   public static final String SET_COOKIE2 = "Set-Cookie2";
 
-  /**
-   * The HTTP {@code Signature} header field name.
-   *
-   * @since NEXT
-   */
-  public static final String SIGNATURE = "Signature";
-
-  /**
-   * The HTTP {@code Signature-Input} header field name.
-   *
-   * @since NEXT
-   */
-  public static final String SIGNATURE_INPUT = "Signature-Input";
-
   /**
    * The HTTP <a href="https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/SourceMap">{@code
    * SourceMap}</a> header field name.