Kill log spam from PlatformKeyboardEvent::getCurrentModifierState.

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..f5b0d9084250359e0a8279b93cde73df8fd5a205 100644
--- a/third_party/WebKit/Source/platform/PlatformKeyboardEvent.cpp
+++ b/third_party/WebKit/Source/platform/PlatformKeyboardEvent.cpp
@@ -113,8 +113,8 @@ PlatformEvent::Modifiers PlatformKeyboardEvent::getCurrentModifierState()
     if (currentModifiers & ::cmdKey)
         modifiers |= MetaKey;
 #else
-    // See https://crbug.com/538289
-    NOTIMPLEMENTED();
+    // TODO(crbug.com/538289): Implement on other platforms.
+    return static_cast<Modifiers>(0);
 #endif
     return static_cast<Modifiers>(modifiers);
 }