Isolated FS for media devices.

base/system_monitor/system_monitor_unittest.cc

Index: base/system_monitor/system_monitor_unittest.cc
diff --git a/base/system_monitor/system_monitor_unittest.cc b/base/system_monitor/system_monitor_unittest.cc
index d3a99fb15844bbdf70c923f5a928ab8188aee69d..fb9ae4380987f0910933fba7fe2a7bb556519528 100644
--- a/base/system_monitor/system_monitor_unittest.cc
+++ b/base/system_monitor/system_monitor_unittest.cc
@@ -110,6 +110,7 @@ TEST_F(SystemMonitorTest, PowerNotifications) {
 TEST_F(SystemMonitorTest, DeviceChangeNotifications) {
   const int kObservers = 5;
   const string16 kDeviceName = ASCIIToUTF16("media device");
+  const FilePath kDevicePath1(FILE_PATH_LITERAL("/testfoo"));
   const std::string kDeviceId1 = "1";
   const std::string kDeviceId2 = "2";
 
@@ -126,12 +127,12 @@ TEST_F(SystemMonitorTest, DeviceChangeNotifications) {
                 OnMediaDeviceAttached(kDeviceId1,
                                       kDeviceName,
                                       base::SystemMonitor::TYPE_PATH,
-                                      testing::_))
-        .InSequence(mock_sequencer[index]);
-    EXPECT_CALL(observers[index], OnMediaDeviceDetached(kDeviceId1))
-        .InSequence(mock_sequencer[index]);
-    EXPECT_CALL(observers[index], OnMediaDeviceDetached(kDeviceId2))
+                                      kDevicePath1.value()))
         .InSequence(mock_sequencer[index]);
+    EXPECT_CALL(observers[index], OnMediaDeviceDetached(
+        kDeviceId1, kDevicePath1.value())).InSequence(mock_sequencer[index]);
+    EXPECT_CALL(observers[index], OnMediaDeviceDetached(
+        kDeviceId2, testing::_)).Times(0);
   }
 
   system_monitor_->ProcessDevicesChanged(base::SystemMonitor::DEVTYPE_UNKNOWN);
@@ -145,7 +146,7 @@ TEST_F(SystemMonitorTest, DeviceChangeNotifications) {
       kDeviceId1,
       kDeviceName,
       base::SystemMonitor::TYPE_PATH,
-      FILE_PATH_LITERAL("path"));
+      kDevicePath1.value());
   message_loop_.RunAllPending();
 
   system_monitor_->ProcessMediaDeviceDetached(kDeviceId1);