Avoid basename conflict from memory_pressure_monitor.cc

base/base.gypi

Index: base/base.gypi
diff --git a/base/base.gypi b/base/base.gypi
index 82d810e36eb5bd614d949e9b81eafe6126f36441..9bd0c28c41114f77817f6cdd00bb44a48204da6d 100644
--- a/base/base.gypi
+++ b/base/base.gypi
@@ -128,8 +128,6 @@
           'callback_internal.h',
           'callback_list.h',
           'cancelable_callback.h',
-          'chromeos/memory_pressure_monitor.cc',
-          'chromeos/memory_pressure_monitor.h',
           'command_line.cc',
           'command_line.h',
           'compiler_specific.h',
@@ -296,8 +294,6 @@
           'mac/mac_util.mm',
           'mac/mach_logging.cc',
           'mac/mach_logging.h',
-          'mac/memory_pressure_monitor.cc',
-          'mac/memory_pressure_monitor.h',
           'mac/objc_property_releaser.h',
           'mac/objc_property_releaser.mm',
           'mac/os_crash_dumps.cc',
@@ -342,6 +338,12 @@
           'memory/memory_pressure_listener.h',
           'memory/memory_pressure_monitor.cc',
           'memory/memory_pressure_monitor.h',
+          'memory/memory_pressure_monitor_chromeos.cc',
+          'memory/memory_pressure_monitor_chromeos.h',
+          'memory/memory_pressure_monitor_mac.cc',
+          'memory/memory_pressure_monitor_mac.h',
+          'memory/memory_pressure_monitor_win.cc',
+          'memory/memory_pressure_monitor_win.h',
           'memory/raw_scoped_refptr_mismatch_checker.h',
           'memory/ref_counted.cc',
           'memory/ref_counted.h',
@@ -709,8 +711,6 @@
           'win/iat_patch_function.h',
           'win/iunknown_impl.cc',
           'win/iunknown_impl.h',
-          'win/memory_pressure_monitor.cc',
-          'win/memory_pressure_monitor.h',
           'win/message_window.cc',
           'win/message_window.h',
           'win/metro.cc',