Remove chromeos::CryptohomeLibrary::IsMounted and convert

chromeos/dbus/mock_cryptohome_client.cc

Index: chromeos/dbus/mock_cryptohome_client.cc
diff --git a/chromeos/dbus/mock_cryptohome_client.cc b/chromeos/dbus/mock_cryptohome_client.cc
index 6ef380d8c8e8a39c7fc9797d8b26443b097e6e62..56ac607dfb94a50b13057bf4f1530c6e4fdd0f43 100644
--- a/chromeos/dbus/mock_cryptohome_client.cc
+++ b/chromeos/dbus/mock_cryptohome_client.cc
@@ -4,9 +4,28 @@
 
 #include "chromeos/dbus/mock_cryptohome_client.h"
 
+#include "base/bind.h"
+#include "base/message_loop.h"
+
+using ::testing::Invoke;
+using ::testing::_;
+
 namespace chromeos {
 
-MockCryptohomeClient::MockCryptohomeClient() {}
+namespace {
+
+// Runs callback with true.
+void RunCallbackWithTrue(const CryptohomeClient::BoolMethodCallback& callback) {
+  MessageLoop::current()->PostTask(
+      FROM_HERE, base::Bind(callback, DBUS_METHOD_CALL_SUCCESS, true));
+}
+
+}  // namespace
+
+MockCryptohomeClient::MockCryptohomeClient() {
+  ON_CALL(*this, IsMounted(_))
+      .WillByDefault(Invoke(&RunCallbackWithTrue));
+}
 
 MockCryptohomeClient::~MockCryptohomeClient() {}