Fix an uninitialized memory error reported by valgrind.
Fix an uninitialized memory error reported by valgrind.

In order to make valgrind happy, this CL changes WebKeyboardEvent::isSystemKey and WebMouseWheelEvent::scrollByPage to int type to make sure the size of WebKeyboardEvent and WebMouseWheelEvent align to a factor of 4 bytes strictly.

BUG=22857: Uninitialized memory sent via IPC from RenderWidgetHostViewGtkWidget::KeyPressReleaseEvent()
TEST=Run chrome with valgrind and input something or scroll the mouse wheel in a web page, valgrind should not complain uninitialized memory anymore.

Review URL: http://codereview.chromium.org/235038

git-svn-id: dd90618784b6a4b323ea0c23a071cb1c9e6f2ac7@27451 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser,wistoch/meego-app-browser