Clean up a few more unused globals.

Found by clang's new -Wunused-const-variable.

BUG=290204
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Review URL: https://codereview.chromium.org/24649002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@225273 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/content/browser/browser_context.cc b/content/browser/browser_context.cc
index 2e76dc0..b720ae48 100644
--- a/content/browser/browser_context.cc
+++ b/content/browser/browser_context.cc
@@ -36,9 +36,12 @@
 
 // Key names on BrowserContext.
 const char kDownloadManagerKeyName[] = "download_manager";
-const char kMountPointsKey[] = "mount_points";
 const char kStorageParitionMapKeyName[] = "content_storage_partition_map";
 
+#if defined(OS_CHROMEOS)
+const char kMountPointsKey[] = "mount_points";
+#endif  // defined(OS_CHROMEOS)
+
 StoragePartitionImplMap* GetStoragePartitionMap(
     BrowserContext* browser_context) {
   StoragePartitionImplMap* partition_map =