I doubt this actually. Google is a much more visible part of everyone's daily life than Exxon. If Google were more valuable than the sum of the entire petroleum industry, then we would have a problem, but as it stands, demand for Google's goods and services is much more inelastic, and relatively more valuable, than Exxon's contributions alone.

Then again, people will call anything a bubble. But its easy to see that this is not evidence of it by asking yourself if we'd be worse off if Google disappeared tomorrow vs if Exxon did.