PPAPI: Format ppapi/thunk using clang-format.

ppapi/thunk/thunk.h

Index: ppapi/thunk/thunk.h
diff --git a/ppapi/thunk/thunk.h b/ppapi/thunk/thunk.h
index 3d4a77f3f77ba3aa69c419c135d3ad4836a32f21..75441bc64f5f1d72acf07765a9efa6e6f9038ca6 100644
--- a/ppapi/thunk/thunk.h
+++ b/ppapi/thunk/thunk.h
@@ -12,11 +12,13 @@
 //
 //   const PPB_Foo* ppapi::thunk::GetPPB_Foo_Thunk();
 //
-#define PROXIED_IFACE(interface_name, InterfaceType) \
-  struct InterfaceType; \
-  namespace ppapi { namespace thunk { \
+#define PROXIED_IFACE(interface_name, InterfaceType)                    \
+  struct InterfaceType;                                                 \
+  namespace ppapi {                                                     \
+  namespace thunk {                                                     \
   PPAPI_THUNK_EXPORT const InterfaceType* Get##InterfaceType##_Thunk(); \
-  } }
+  }                                                                     \
+  }
 
 #include "ppapi/thunk/interfaces_ppb_private.h"
 #include "ppapi/thunk/interfaces_ppb_private_no_permissions.h"