Switch to standard integer types in ash/.

ash/display/mirror_window_controller.cc

Index: ash/display/mirror_window_controller.cc
diff --git a/ash/display/mirror_window_controller.cc b/ash/display/mirror_window_controller.cc
index 06ada9f776404f78b303225f6827c97f06bde575..7daadcef9a8f2887ded0a07b02317b65111ddc15 100644
--- a/ash/display/mirror_window_controller.cc
+++ b/ash/display/mirror_window_controller.cc
@@ -327,7 +327,7 @@ gfx::Display MirrorWindowController::GetDisplayForRootWindow(
   for (const auto& pair : mirroring_host_info_map_) {
     if (pair.second->ash_host->AsWindowTreeHost()->window() == root) {
       // Sanity check to catch an error early.
-      int64 id = pair.first;
+      int64_t id = pair.first;
       const DisplayManager::DisplayList& list =
           Shell::GetInstance()
               ->display_manager()
@@ -344,7 +344,7 @@ gfx::Display MirrorWindowController::GetDisplayForRootWindow(
 }
 
 AshWindowTreeHost* MirrorWindowController::GetAshWindowTreeHostForDisplayId(
-    int64 id) {
+    int64_t id) {
   CHECK_EQ(1u, mirroring_host_info_map_.count(id));
   return mirroring_host_info_map_[id]->ash_host.get();
 }