Pass BrowserContext to drive::MountPointProviderDelegate.

chrome/browser/chromeos/drive/mount_point_provider_delegate.h

Index: chrome/browser/chromeos/drive/mount_point_provider_delegate.h
diff --git a/chrome/browser/chromeos/drive/mount_point_provider_delegate.h b/chrome/browser/chromeos/drive/mount_point_provider_delegate.h
index b5a4734fe2928a05d7487e6191aa5d88dd594973..07ad8bd138a36d7c12af02992515897ceb191404 100644
--- a/chrome/browser/chromeos/drive/mount_point_provider_delegate.h
+++ b/chrome/browser/chromeos/drive/mount_point_provider_delegate.h
@@ -9,6 +9,10 @@
 #include "base/memory/ref_counted.h"
 #include "chrome/browser/chromeos/fileapi/cros_mount_point_provider_delegate.h"
 
+namespace content {
+class BrowserContext;
+}  // namespace content
+
 namespace fileapi {
 class ExternalMountPoints;
 }  // namespace fileapi
@@ -20,8 +24,9 @@ namespace drive {
 class MountPointProviderDelegate
     : public chromeos::CrosMountPointProviderDelegate {
  public:
+  // |browser_context| is currently used to take the ExternalMountPoints.
   explicit MountPointProviderDelegate(
-      fileapi::ExternalMountPoints* mount_points);
+      content::BrowserContext* browser_context);
   virtual ~MountPointProviderDelegate();
 
   // CrosMountPointProvider::Delegate overrides.