Avoid basename conflict from memory_pressure_monitor.cc

base/base.gyp

Index: base/base.gyp
diff --git a/base/base.gyp b/base/base.gyp
index ff6ce00e246404f14419fb11fed3ee60329d9ba9..4b1bdcdd86ff477772b6bba542abe795337e20e4 100644
--- a/base/base.gyp
+++ b/base/base.gyp
@@ -458,7 +458,6 @@
         'callback_unittest.cc',
         'callback_unittest.nc',
         'cancelable_callback_unittest.cc',
-        'chromeos/memory_pressure_monitor_unittest.cc',
         'command_line_unittest.cc',
         'containers/adapters_unittest.cc',
         'containers/hash_tables_unittest.cc',
@@ -518,7 +517,6 @@
         'mac/foundation_util_unittest.mm',
         'mac/libdispatch_task_runner_unittest.cc',
         'mac/mac_util_unittest.mm',
-        'mac/memory_pressure_monitor_unittest.cc',
         'mac/objc_property_releaser_unittest.mm',
         'mac/scoped_nsobject_unittest.mm',
         'mac/scoped_objc_class_swizzler_unittest.mm',
@@ -527,6 +525,9 @@
         'memory/aligned_memory_unittest.cc',
         'memory/discardable_shared_memory_unittest.cc',
         'memory/linked_ptr_unittest.cc',
+        'memory/memory_pressure_monitor_chromeos_unittest.cc',
+        'memory/memory_pressure_monitor_mac_unittest.cc',
+        'memory/memory_pressure_monitor_win_unittest.cc',
         'memory/ref_counted_memory_unittest.cc',
         'memory/ref_counted_unittest.cc',
         'memory/scoped_ptr_unittest.cc',
@@ -655,7 +656,6 @@
         'win/event_trace_provider_unittest.cc',
         'win/i18n_unittest.cc',
         'win/iunknown_impl_unittest.cc',
-        'win/memory_pressure_monitor_unittest.cc',
         'win/message_window_unittest.cc',
         'win/object_watcher_unittest.cc',
         'win/pe_image_unittest.cc',