drive: Switch Drive mount path to per-profile one.

chrome/browser/chromeos/drive/drive_integration_service.cc

Index: chrome/browser/chromeos/drive/drive_integration_service.cc
diff --git a/chrome/browser/chromeos/drive/drive_integration_service.cc b/chrome/browser/chromeos/drive/drive_integration_service.cc
index 9a08bb4281f541ad1265397ef235a5a55d467af5..bd495241058e2e1900627eea221f297f2f7a1c1c 100644
--- a/chrome/browser/chromeos/drive/drive_integration_service.cc
+++ b/chrome/browser/chromeos/drive/drive_integration_service.cc
@@ -353,8 +353,10 @@ bool DriveIntegrationService::IsMounted() const {
   // Look up the registered path, and just discard it.
   // GetRegisteredPath() returns true if the path is available.
   base::FilePath unused;
-  return BrowserContext::GetMountPoints(profile_)->GetRegisteredPath(
-      mount_point_name_, &unused);
+  fileapi::ExternalMountPoints* const mount_points =
+      fileapi::ExternalMountPoints::GetSystemInstance();
+  DCHECK(mount_points);
+  return mount_points->GetRegisteredPath(mount_point_name_, &unused);
 }
 
 void DriveIntegrationService::AddObserver(
@@ -431,8 +433,8 @@ void DriveIntegrationService::AddDriveMountPoint() {
       util::GetDriveMountPointPath(profile_);
   if (mount_point_name_.empty())
     mount_point_name_ = drive_mount_point.BaseName().AsUTF8Unsafe();
-  fileapi::ExternalMountPoints* mount_points =
-      BrowserContext::GetMountPoints(profile_);
+  fileapi::ExternalMountPoints* const mount_points =
+      fileapi::ExternalMountPoints::GetSystemInstance();
   DCHECK(mount_points);
 
   bool success = mount_points->RegisterFileSystem(
@@ -457,8 +459,8 @@ void DriveIntegrationService::RemoveDriveMountPoint() {
     FOR_EACH_OBSERVER(DriveIntegrationServiceObserver, observers_,
                       OnFileSystemBeingUnmounted());
 
-    fileapi::ExternalMountPoints* mount_points =
-        BrowserContext::GetMountPoints(profile_);
+    fileapi::ExternalMountPoints* const mount_points =
+        fileapi::ExternalMountPoints::GetSystemInstance();
     DCHECK(mount_points);
 
     mount_points->RevokeFileSystem(mount_point_name_);