Remove dead code from CppCompileAction.java.

VALIDATION_DEBUG_WARN is always false and no other references exist, so this should be safe?

RELNOTES: None.
PiperOrigin-RevId: 543681170
Change-Id: Ieef1262681ad8c75c63bc157d25d36f73496d38f

src/main/java/com/google/devtools/build/lib/rules/cpp/CppCompileAction.java

@@ -30,7 +30,6 @@
 import com.google.common.collect.ImmutableSet;
 import com.google.common.collect.Iterables;
 import com.google.common.collect.Maps;
-import com.google.common.collect.Sets;
 import com.google.common.io.ByteStreams;
 import com.google.devtools.build.lib.actions.AbstractAction;
 import com.google.devtools.build.lib.actions.ActionEnvironment;
@@ -124,8 +123,6 @@ public class CppCompileAction extends AbstractAction implements IncludeScannable
 
   private static final PathFragment BUILD_PATH_FRAGMENT = PathFragment.create("BUILD");
 
-  private static final boolean VALIDATION_DEBUG_WARN = false;
-
   @VisibleForTesting static final String CPP_COMPILE_MNEMONIC = "CppCompile";
   @VisibleForTesting static final String OBJC_COMPILE_MNEMONIC = "ObjcCompile";
 
@@ -1058,29 +1055,6 @@ public void validateInclusions(
         errors.add(input.getExecPath().toString());
       }
     }
-    if (VALIDATION_DEBUG_WARN) {
-      synchronized (System.err) {
-        if (errors.hasProblems()) {
-          if (errors.hasProblems()) {
-            System.err.println("ERROR: Include(s) were not in declared srcs:");
-          } else {
-            System.err.println(
-                "INFO: Include(s) were OK for '" + getSourceFile() + "', declared srcs:");
-          }
-          for (Artifact a : ccCompilationContext.getDeclaredIncludeSrcs().toList()) {
-            System.err.println("  '" + a.toDetailString() + "'");
-          }
-          System.err.println(" or under loose headers dirs:");
-          for (PathFragment f : Sets.newTreeSet(ccCompilationContext.getLooseHdrsDirs().toList())) {
-            System.err.println("  '" + f + "'");
-          }
-          System.err.println(" with prefixes:");
-          for (PathFragment dirpath : ccCompilationContext.getQuoteIncludeDirs()) {
-            System.err.println("  '" + dirpath + "'");
-          }
-        }
-      }
-    }
     errors.assertProblemFree(this, getSourceFile());
   }