Amusingly deprecate the generic version of 'ExceptionState::throwDOMException'.

In an ideal world, everyone should write exceptionally detailed error
messages when throwing exceptions. We'll move a bit closer to that world by
requiring a second argument to 'throwDOMException'.

This CL brought to you by the magic of `git grep` and `sed` (not
`ed`, Jochen's protestations to the contrary):

  git grep -n -l -e 'throwDOMException\(\w*\)' -- '*.h' '*.cpp' '*.cc' | xargs -L1 sed -i '' -e 's/throwDOMException(\([a-zA-Z]*\))/throwUninformativeAndGenericDOMException(\1)/g'

BUG=270033

Review URL: https://chromiumcodereview.appspot.com/24469004

git-svn-id: svn://svn.chromium.org/blink/trunk@158313 bbb929c8-8fbe-4397-9dbb-9b2b20218538