memory-infra: Disable two MemoryDumpManager tests on iOS

base/trace_event/memory_dump_manager_unittest.cc

Index: base/trace_event/memory_dump_manager_unittest.cc
diff --git a/base/trace_event/memory_dump_manager_unittest.cc b/base/trace_event/memory_dump_manager_unittest.cc
index b7bd426990616c3c817452f86791b59b3e67e01c..86c90d43f05261aa90f97e2eebb4fb2316cd37db 100644
--- a/base/trace_event/memory_dump_manager_unittest.cc
+++ b/base/trace_event/memory_dump_manager_unittest.cc
@@ -32,6 +32,7 @@
 #include "base/trace_event/process_memory_dump.h"
 #include "base/trace_event/trace_buffer.h"
 #include "base/trace_event/trace_config_memory_test_util.h"
+#include "build/build_config.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ -439,8 +440,13 @@ TEST_F(MemoryDumpManagerTest, MultipleDumpers) {
 
 // Checks that the dump provider invocations depend only on the current
 // registration state and not on previous registrations and dumps.
-// flaky: crbug.com/706874
-TEST_F(MemoryDumpManagerTest, DISABLED_RegistrationConsistency) {
+// Flaky on iOS, see crbug.com/706874
+#if defined(OS_IOS)
+#define MAYBE_RegistrationConsistency DISABLED_RegistrationConsistency
+#else
+#define MAYBE_RegistrationConsistency RegistrationConsistency
+#endif
+TEST_F(MemoryDumpManagerTest, MAYBE_RegistrationConsistency) {
   InitializeMemoryDumpManager(false /* is_coordinator */);
   MockMemoryDumpProvider mdp;
 
@@ -1014,8 +1020,13 @@ TEST_F(MemoryDumpManagerTest, TraceConfigExpectationsWhenIsCoordinator) {
 
 // Tests against race conditions that might arise when disabling tracing in the
 // middle of a global memory dump.
-// flaky: crbug.com/706874
-TEST_F(MemoryDumpManagerTest, DISABLED_DisableTracingWhileDumping) {
+// Flaky on iOS, see crbug.com/706961
+#if defined(OS_IOS)
+#define MAYBE_DisableTracingWhileDumping DISABLED_DisableTracingWhileDumping
+#else
+#define MAYBE_DisableTracingWhileDumping DisableTracingWhileDumping
+#endif
+TEST_F(MemoryDumpManagerTest, MAYBE_DisableTracingWhileDumping) {
   base::WaitableEvent tracing_disabled_event(
       WaitableEvent::ResetPolicy::AUTOMATIC,
       WaitableEvent::InitialState::NOT_SIGNALED);