Try to respect the Google Maps Terms of Service

9.4 Attribution.

• Content provided to you through the Service may contain the Brand Features of Google, its strategic partners, or other third-party rights holders of content that Google indexes. When Google provides those Brand Features or other attribution through the Service, you must display such attribution as provided (or as described in the Maps APIs Documentation) and must not delete or alter the attribution.
• You must conspicuously display the "powered by Google" attribution (and any other attribution(s) required by Google in the Maps APIs Documentation) on or adjacent to the relevant Service search box and Google search results. If you use the standard Google search control, or the standard Google search control form, this attribution will be included automatically, and you must not modify or obscure this automatically-generated attribution.

Developers don't have the authority to replace the logo even though it's possible.