https://code.google.com/p/chromium/codesearch#chromium/src/third_party/WebKit/Source/core/html/forms/EmailInputType.cpp&q=EmailInputType.cpp&sq=package:chromium&l=142

loyso@ in https://codereview.chromium.org/1360723003 made us forcibly clear the V8PerContextData in the regex scope when doing leak detection. This is to compensate for the fact that the static local makes the V8PerContextData live forever.

We should probably just not create the static local ScriptRegexp at all and instead create a new one each time. If we think creating the regex object is too expensive we can cache it as a property of the v8::Context itself, though v8 is supposed to cache regexes for us anyway, so in theory creating a new ScriptRegexp for each EmailInputType should be "cheap".

Doing this allows us to clear the regex context when under memory pressure, or periodically, since it's not used very often (only form validation and some random inspector things). Doing a single form validation should probably not cause a permanent memory increase the size of a v8::Context.