Replace prepareToSuspend() with onMemoryStateChange(SUSPENDED)

third_party/WebKit/Source/platform/MemoryCoordinator.h

Index: third_party/WebKit/Source/platform/MemoryCoordinator.h
diff --git a/third_party/WebKit/Source/platform/MemoryCoordinator.h b/third_party/WebKit/Source/platform/MemoryCoordinator.h
index c19de9a211491c7d111206b892e96335dc6eea91..0aa61c576e6a2fab183781000ee124da85bc1f2e 100644
--- a/third_party/WebKit/Source/platform/MemoryCoordinator.h
+++ b/third_party/WebKit/Source/platform/MemoryCoordinator.h
@@ -17,11 +17,6 @@ class PLATFORM_EXPORT MemoryCoordinatorClient : public GarbageCollectedMixin {
  public:
   virtual ~MemoryCoordinatorClient() {}
 
-  // Called when MemoryCoordinator is asked to prepare for suspending
-  // the renderer. Clients should purge discardable memory as much as
-  // possible.
-  virtual void prepareToSuspend() {}
-
   // TODO(bashi): Deprecating. Remove this when MemoryPressureListener is
   // gone.
   virtual void onMemoryPressure(WebMemoryPressureLevel) {}
@@ -41,8 +36,6 @@ class PLATFORM_EXPORT MemoryCoordinator final
   void registerClient(MemoryCoordinatorClient*);
   void unregisterClient(MemoryCoordinatorClient*);
 
-  void prepareToSuspend();
-
   // TODO(bashi): Deprecating. Remove this when MemoryPressureListener is
   // gone.
   void onMemoryPressure(WebMemoryPressureLevel);