Rename PPB_Flash_DeviceID interface to PPB_Flash_DRM

ppapi/cpp/private/flash_drm.h

Index: ppapi/cpp/private/flash_drm.h
diff --git a/ppapi/cpp/private/flash_device_id.h b/ppapi/cpp/private/flash_drm.h
similarity index 66%
copy from ppapi/cpp/private/flash_device_id.h
copy to ppapi/cpp/private/flash_drm.h
index 33c5e55652f17f1dfa6c93327f955d4d4913a759..49e37c2e718eb7b32c7055f2f8abb1e67f228416 100644
--- a/ppapi/cpp/private/flash_device_id.h
+++ b/ppapi/cpp/private/flash_drm.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef PPAPI_CPP_PRIVATE_FLASH_DEVICE_ID_H_
-#define PPAPI_CPP_PRIVATE_FLASH_DEVICE_ID_H_
+#ifndef PPAPI_CPP_PRIVATE_FLASH_DRM_H_
+#define PPAPI_CPP_PRIVATE_FLASH_DRM_H_
 
 #include "ppapi/cpp/completion_callback.h"
 #include "ppapi/cpp/resource.h"
@@ -11,10 +11,10 @@
 namespace pp {
 namespace flash {
 
-class DeviceID : public Resource {
+class DRM : public Resource {
  public:
-  DeviceID();
-  DeviceID(const InstanceHandle& instance);
+  DRM();
+  explicit DRM(const InstanceHandle& instance);
 
   // On success, returns a string var.
   int32_t GetDeviceID(const CompletionCallbackWithOutput<Var>& callback);
@@ -23,4 +23,4 @@ class DeviceID : public Resource {
 }  // namespace flash
 }  // namespace pp
 
-#endif  // PPAPI_CPP_PRIVATE_FLASH_DEVICE_ID_H_
+#endif  // PPAPI_CPP_PRIVATE_FLASH_DRM_H_