Add missing trailing newline before EGLWindow.cpp EOF

BUG=angleproject:892

Change-Id: Iaf175a310ce2acb5a8715902b3d367aa3dae8e2c
Reviewed-on: https://chromium-review.googlesource.com/269124
Reviewed-by: Jamie Madill <jmadill@chromium.org>
Tested-by: Corentin Wallez <cwallez@chromium.org>

util/EGLWindow.cpp

@@ -231,4 +231,4 @@ bool EGLWindow::isGLInitialized() const
     return mSurface != EGL_NO_SURFACE &&
            mContext != EGL_NO_CONTEXT &&
            mDisplay != EGL_NO_DISPLAY;
-}
+}