By Alexei Oreskovic SAN FRANCISCO (Reuters) - Google Inc's reshuffle of its senior ranks underscores the Internet company’s evolving business ambitions, analysts say. Four years after co-founder Larry Page took the reins back as chief executive officer, his team of lieutenants is clearly undergoing a refresh. On Thursday, Google announced the surprise departure of its veteran business chief Nikesh Arora, who will become Vice Chairman of SoftBank Corp. Arora represents the latest in a string of personnel changes within Google’s top ranks over the past 16 months, affecting major divisions from Youtube to its popular Android mobile software. They included the departed Vic Gundotra, who oversaw the Google+ social network;



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