Revert of Remove platform/NotImplemented.*.

third_party/WebKit/Source/platform/PlatformKeyboardEvent.cpp

Index: third_party/WebKit/Source/platform/PlatformKeyboardEvent.cpp
diff --git a/third_party/WebKit/Source/platform/PlatformKeyboardEvent.cpp b/third_party/WebKit/Source/platform/PlatformKeyboardEvent.cpp
index 0d7cf82d21d0589350f84bec28e35a5aa29ad9a9..191cba1a336831ae95c1ad4c7dceafac7e66d0f3 100644
--- a/third_party/WebKit/Source/platform/PlatformKeyboardEvent.cpp
+++ b/third_party/WebKit/Source/platform/PlatformKeyboardEvent.cpp
@@ -30,6 +30,8 @@
 #include <windows.h>
 #elif OS(MACOSX)
 #import <Carbon/Carbon.h>
+#else
+#include "platform/NotImplemented.h"
 #endif
 
 namespace blink {
@@ -81,7 +83,7 @@
 #elif OS(MACOSX)
             return GetCurrentKeyModifiers() & alphaLock;
 #else
-            NOTIMPLEMENTED();
+            notImplemented();
             return false;
 #endif
     case OverrideCapsLockState::On:
@@ -114,7 +116,7 @@
         modifiers |= MetaKey;
 #else
     // See https://crbug.com/538289
-    NOTIMPLEMENTED();
+    notImplemented();
 #endif
     return static_cast<Modifiers>(modifiers);
 }