Fix more -Wsign-compare warnings in heap, mips, base, etc.

test/unittests/zone/zone-chunk-list-unittest.cc

Index: test/unittests/zone/zone-chunk-list-unittest.cc
diff --git a/test/unittests/zone/zone-chunk-list-unittest.cc b/test/unittests/zone/zone-chunk-list-unittest.cc
index 11790bb072782fcbee0cd9813834a9949fdce75b..2969366bc7009d24abc4f77c880715e64a7028d6 100644
--- a/test/unittests/zone/zone-chunk-list-unittest.cc
+++ b/test/unittests/zone/zone-chunk-list-unittest.cc
@@ -93,7 +93,7 @@ TEST(ZoneChunkList, RewindTest) {
     count++;
   }
 
-  EXPECT_EQ(count, 42);
+  EXPECT_EQ(count, 42u);
   EXPECT_EQ(count, zone_chunk_list.size());
 
   zone_chunk_list.Rewind(0);
@@ -105,7 +105,7 @@ TEST(ZoneChunkList, RewindTest) {
     count++;
   }
 
-  EXPECT_EQ(count, 0);
+  EXPECT_EQ(count, 0u);
   EXPECT_EQ(count, zone_chunk_list.size());
 
   zone_chunk_list.Rewind(100);
@@ -117,7 +117,7 @@ TEST(ZoneChunkList, RewindTest) {
     count++;
   }
 
-  EXPECT_EQ(count, 0);
+  EXPECT_EQ(count, 0u);
   EXPECT_EQ(count, zone_chunk_list.size());
 }
 
@@ -137,7 +137,7 @@ TEST(ZoneChunkList, FindTest) {
 
   *zone_chunk_list.Find(index) = 42;
 
-  EXPECT_EQ(*zone_chunk_list.Find(index), 42);
+  EXPECT_EQ(*zone_chunk_list.Find(index), 42u);
 }
 
 TEST(ZoneChunkList, CopyToTest) {