Tom Perkins, 73, poses in his office in San Francisco in 2006.(Photo: Eric Risberg, AP) SAN FRANCISCO — Venture capital legend Thomas J. Perkins, whose storied Silicon Valley firm helped launch Google, Amazon and countless other tech giants, has died. He was 84. The co-founder of Kleiner Perkins Caufield & Byers, arguably the most-well known VC firm...