Deprecate GetDirectoryFromPath on non-Windows.

Due to a bunch of changes I made last week, we now only need this
in Windows-specific codepaths.

BUG=24672

Review URL: http://codereview.chromium.org/654009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@39715 0039d316-1c4b-4281-b951-d872f2087c98


CrOS-Libchrome-Original-Commit: a18f79afc7cf1d3369d07a2e59b4ee100d9ff9fa
diff --git a/base/file_util_unittest.cc b/base/file_util_unittest.cc
index 31bb46f..ae6560d 100644
--- a/base/file_util_unittest.cc
+++ b/base/file_util_unittest.cc
@@ -311,6 +311,8 @@
 #endif
 };
 
+#if defined(OS_WIN)
+// This function is deprecated, and only exists on Windows anymore.
 TEST_F(FileUtilTest, GetDirectoryFromPath) {
   for (unsigned int i = 0; i < arraysize(dir_cases); ++i) {
     const dir_case& dir = dir_cases[i];
@@ -319,6 +321,7 @@
     EXPECT_EQ(dir.directory, parent);
   }
 }
+#endif
 
 TEST_F(FileUtilTest, CountFilesCreatedAfter) {
   // Create old file (that we don't want to count)