Revert APPDATA check for Windows in MtlsUtils and remove corresponding test

Author: vverman

oauth2_http/java/com/google/auth/mtls/MtlsUtils.java

@@ -123,12 +123,7 @@ private static File getWellKnownCertificateConfigFile(
     } else {
       String osName = propProvider.getProperty("os.name", "").toLowerCase(Locale.US);
       if (osName.indexOf("windows") >= 0) {
-        String appData = envProvider.getEnv("APPDATA");
-        if (Strings.isNullOrEmpty(appData)) {
-          throw new CertificateSourceUnavailableException(
-              "APPDATA environment variable is not set on Windows.");
-        }
-        File appDataPath = new File(appData);
+        File appDataPath = new File(envProvider.getEnv("APPDATA"));
         cloudConfigPath = new File(appDataPath, CLOUDSDK_CONFIG_DIRECTORY);
       } else {
         File configPath = new File(propProvider.getProperty("user.home", ""), ".config");

oauth2_http/javatests/com/google/auth/mtls/MtlsUtilsTest.java

@@ -219,28 +219,5 @@ public String getProperty(String name, String def) {
     assertTrue(exception.getMessage().contains(expectedPath));
   }
 
-  @Test
-  void getWellKnownCertificateConfigFile_windows_missingAppData_throws() {
-    EnvironmentProvider envProvider =
-        new EnvironmentProvider() {
-          @Override
-          public String getEnv(String name) {
-            return null;
-          }
-        };
-    PropertyProvider propProvider =
-        new PropertyProvider() {
-          @Override
-          public String getProperty(String name, String def) {
-            return "os.name".equals(name) ? "Windows 10" : def;
-          }
-        };
-
-    CertificateSourceUnavailableException exception =
-        assertThrows(
-            CertificateSourceUnavailableException.class,
-            () -> MtlsUtils.getWorkloadCertificateConfiguration(envProvider, propProvider, null));
 
-    assertEquals("APPDATA environment variable is not set on Windows.", exception.getMessage());
-  }
 }