Restore FSP API's read tests.

chrome/browser/chromeos/extensions/file_system_provider/file_system_provider_apitest.cc

Index: chrome/browser/chromeos/extensions/file_system_provider/file_system_provider_apitest.cc
diff --git a/chrome/browser/chromeos/extensions/file_system_provider/file_system_provider_apitest.cc b/chrome/browser/chromeos/extensions/file_system_provider/file_system_provider_apitest.cc
index 595ea45cec9163808efec23b82ac871c80099801..4b785c2a787d5df4c4d1895cdac8c1d6a702927b 100644
--- a/chrome/browser/chromeos/extensions/file_system_provider/file_system_provider_apitest.cc
+++ b/chrome/browser/chromeos/extensions/file_system_provider/file_system_provider_apitest.cc
@@ -159,13 +159,7 @@ IN_PROC_BROWSER_TEST_F(FileSystemProviderApiTest, ReadDirectory) {
       << message_;
 }
 
-// http://crbug.com/691449
-#if defined(OS_CHROMEOS)
-#define MAYBE_ReadFile DISABLED_ReadFile
-#else
-#define MAYBE_ReadFile ReadFile
-#endif
-IN_PROC_BROWSER_TEST_F(FileSystemProviderApiTest, MAYBE_ReadFile) {
+IN_PROC_BROWSER_TEST_F(FileSystemProviderApiTest, ReadFile) {
   ASSERT_TRUE(RunPlatformAppTestWithFlags("file_system_provider/read_file",
                                           kFlagLoadAsComponent))
       << message_;