Remove deprecated --incremental-code-compaction flag.

R=hpayer@chromium.org

Review URL: https://codereview.chromium.org/1216153004

Cr-Commit-Position: refs/heads/master@{#29405}

src/flag-definitions.h

@@ -672,10 +672,7 @@ DEFINE_BOOL(native_code_counters, false,
 DEFINE_BOOL(always_compact, false, "Perform compaction on every full GC")
 DEFINE_BOOL(never_compact, false,
             "Never perform compaction on full GC - testing only")
-DEFINE_BOOL(compact_code_space, true,
-            "Compact code space on full non-incremental collections")
-DEFINE_BOOL(incremental_code_compaction, true,
-            "Compact code space on full incremental collections")
+DEFINE_BOOL(compact_code_space, true, "Compact code space on full collections")
 DEFINE_BOOL(cleanup_code_caches_at_gc, true,
             "Flush inline caches prior to mark compact collection and "
             "flush code caches in maps during mark compact cycle.")

src/heap/mark-compact.cc

@@ -260,8 +260,7 @@ bool MarkCompactCollector::StartCompaction(CompactionMode mode) {
 
     CollectEvacuationCandidates(heap()->old_space());
 
-    if (FLAG_compact_code_space && (mode == NON_INCREMENTAL_COMPACTION ||
-                                    FLAG_incremental_code_compaction)) {
+    if (FLAG_compact_code_space) {
       CollectEvacuationCandidates(heap()->code_space());
     } else if (FLAG_trace_fragmentation) {
       TraceFragmentation(heap()->code_space());