Remove ThrowableSubject.hasMessage(), which has been long-deprecated.

RELNOTES=Removed ThrowableSubject.hasMessage()

-------------
Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=240404303

Author: dimo414

core/src/main/java/com/google/common/truth/ThrowableSubject.java

@@ -35,18 +35,6 @@ public class ThrowableSubject extends Subject<ThrowableSubject, Throwable> {
    * suppressed exception
    */
 
-  /**
-   * Fails if the subject does not have the given message.
-   *
-   * @deprecated Use {@code hasMessageThat().isEqualTo(expected)} instead. You may also consider
-   *     using inexact matching of the message (e.g. {@code hasMessageThat().contains(substring)})
-   *     for less brittle tests.
-   */
-  @Deprecated
-  public final void hasMessage(@NullableDecl String expected) {
-    hasMessageThat().isEqualTo(expected);
-  }
-
   /** Returns a {@code StringSubject} to make assertions about the throwable's message. */
   public final StringSubject hasMessageThat() {
     StandardSubjectBuilder check = check("getMessage()");

core/src/test/java/com/google/common/truth/ThrowableSubjectTest.java

@@ -30,13 +30,6 @@
 @RunWith(JUnit4.class)
 public class ThrowableSubjectTest extends BaseSubjectTestCase {
 
-  @SuppressWarnings("deprecation")
-  @Test
-  public void hasMessage() {
-    NullPointerException npe = new NullPointerException("message");
-    assertThat(npe).hasMessage("message");
-  }
-
   @Test
   public void hasMessageThat() {
     NullPointerException npe = new NullPointerException("message");