Move memory_coordinator_client and its registry to base/memory

components/memory_coordinator/public/interfaces/child_memory_coordinator.mojom

Index: components/memory_coordinator/public/interfaces/child_memory_coordinator.mojom
diff --git a/components/memory_coordinator/public/interfaces/child_memory_coordinator.mojom b/components/memory_coordinator/public/interfaces/child_memory_coordinator.mojom
index 0c3e889e589a47360523de644a9e9d618760af01..e7d74b36bbe1b1681407b8949e1e1fb2c42df890 100644
--- a/components/memory_coordinator/public/interfaces/child_memory_coordinator.mojom
+++ b/components/memory_coordinator/public/interfaces/child_memory_coordinator.mojom
@@ -4,17 +4,12 @@
 
 module memory_coordinator.mojom;
 
-// MemoryState is an indicator that processes can use to guide their memory
-// allocation policies. For example, a process that receives the suspended
-// state can use that as as signal to drop memory caches.
+// See base/memory/memory_coordinator_client.h for the definitions of these
+// states.
 enum MemoryState {
-  // The state is unknown.
   UNKNOWN = -1,
-  // No memory constraints.
   NORMAL = 0,
-  // Running and interactive but allocation should be throttled.
   THROTTLED = 1,
-  // Still resident in memory but core processing logic has been suspended.
   SUSPENDED = 2,
 };