Added checking for higher bit being set in GetAsyncKeyState return value.

content/browser/renderer_host/input/web_input_event_builders_win.cc

Index: content/browser/renderer_host/input/web_input_event_builders_win.cc
diff --git a/content/browser/renderer_host/input/web_input_event_builders_win.cc b/content/browser/renderer_host/input/web_input_event_builders_win.cc
index 8c63e44db0905edbeed2947b30727154d82831e4..2541bcae70fa2119e50f072667213784cba945bb 100644
--- a/content/browser/renderer_host/input/web_input_event_builders_win.cc
+++ b/content/browser/renderer_host/input/web_input_event_builders_win.cc
@@ -339,9 +339,9 @@ WebMouseWheelEventBuilder::Build(HWND hwnd, UINT message,
     // for key state since we are synthesizing the input event.
     get_key_state_func = GetAsyncKeyState;
     key_state = 0;
-    if (get_key_state_func(VK_SHIFT))
+    if (get_key_state_func(VK_SHIFT) & 0x8000)
       key_state |= MK_SHIFT;
-    if (get_key_state_func(VK_CONTROL))
+    if (get_key_state_func(VK_CONTROL) & 0x8000)
       key_state |= MK_CONTROL;
     // NOTE: There doesn't seem to be a way to query the mouse button state
     // in this case.