arc: Partially migrate mojo types

components/arc/crash_collector/arc_crash_collector_bridge.h

Index: components/arc/crash_collector/arc_crash_collector_bridge.h
diff --git a/components/arc/crash_collector/arc_crash_collector_bridge.h b/components/arc/crash_collector/arc_crash_collector_bridge.h
index 6bc78c4923d626e0e8879baee1ac1259348d6587..ec4fcdffb92a99b6e3bcfad229c9a0d7a91e455b 100644
--- a/components/arc/crash_collector/arc_crash_collector_bridge.h
+++ b/components/arc/crash_collector/arc_crash_collector_bridge.h
@@ -13,7 +13,6 @@
 #include "components/arc/common/crash_collector.mojom.h"
 #include "components/arc/instance_holder.h"
 #include "mojo/public/cpp/bindings/binding.h"
-#include "mojo/public/cpp/bindings/string.h"
 
 namespace base {
 class TaskRunner;
@@ -37,11 +36,11 @@ class ArcCrashCollectorBridge
   void OnInstanceReady() override;
 
   // mojom::CrashCollectorHost overrides.
-  void DumpCrash(const mojo::String& type, mojo::ScopedHandle pipe) override;
+  void DumpCrash(const std::string& type, mojo::ScopedHandle pipe) override;
 
-  void SetBuildProperties(const mojo::String& device,
-                          const mojo::String& board,
-                          const mojo::String& cpu_abi) override;
+  void SetBuildProperties(const std::string& device,
+                          const std::string& board,
+                          const std::string& cpu_abi) override;
 
  private:
   scoped_refptr<base::TaskRunner> blocking_task_runner_;