Make fatal out of memory messages uniform.

runtime/platform/hashmap.cc

Index: runtime/platform/hashmap.cc
diff --git a/runtime/platform/hashmap.cc b/runtime/platform/hashmap.cc
index 34f7ea1284f9f48b38890c95496935551556dcd3..461153398129a270433f45682ffd8f0765885a91 100644
--- a/runtime/platform/hashmap.cc
+++ b/runtime/platform/hashmap.cc
@@ -166,9 +166,7 @@ void HashMap::Initialize(uint32_t capacity) {
   ASSERT(dart::Utils::IsPowerOfTwo(capacity));
   map_ = new Entry[capacity];
   if (map_ == NULL) {
-    // TODO(sgjesse): Handle out of memory.
-    FATAL("Cannot allocate memory for hashmap");
-    return;
+    OUT_OF_MEMORY();
   }
   capacity_ = capacity;
   occupancy_ = 0;