[heap] Remove obsolete DisallowAllocationFailure scope.

src/assert-scope.h

Index: src/assert-scope.h
diff --git a/src/assert-scope.h b/src/assert-scope.h
index 0f1e056fbac711ecc82e937a858e021f1a91574c..8757a329100588f9c9f0d9c15873a58b57def24f 100644
--- a/src/assert-scope.h
+++ b/src/assert-scope.h
@@ -29,7 +29,6 @@ enum PerThreadAssertType {
 enum PerIsolateAssertType {
   JAVASCRIPT_EXECUTION_ASSERT,
   JAVASCRIPT_EXECUTION_THROWS,
-  ALLOCATION_FAILURE_ASSERT,
   DEOPTIMIZATION_ASSERT,
   COMPILATION_ASSERT
 };
@@ -156,14 +155,6 @@ typedef PerIsolateAssertScope<JAVASCRIPT_EXECUTION_THROWS, false>
 typedef PerIsolateAssertScope<JAVASCRIPT_EXECUTION_THROWS, true>
     NoThrowOnJavascriptExecution;
 
-// Scope to document where we do not expect an allocation failure.
-typedef PerIsolateAssertScopeDebugOnly<ALLOCATION_FAILURE_ASSERT, false>
-    DisallowAllocationFailure;
-
-// Scope to introduce an exception to DisallowAllocationFailure.
-typedef PerIsolateAssertScopeDebugOnly<ALLOCATION_FAILURE_ASSERT, true>
-    AllowAllocationFailure;
-
 // Scope to document where we do not expect deoptimization.
 typedef PerIsolateAssertScopeDebugOnly<DEOPTIMIZATION_ASSERT, false>
     DisallowDeoptimization;