[editing] beforeInput: Unify "deleteContent" and "deleteComposedCharacter" (#118)

Having both "deleteContent" and "deleteComposedCharacter" is redundant. Web author can know whether text composition is ongoing or not.

If in "text composition" and out of "text composition" is important, we should also have "insertComposedCharacter" too. Note: we should have "insertComposedText" instead of "insertComposedCharacter", since IME can insert multiple character by one user action e.g. ASCII emoji, (^_^), auto correction, auto expanding of abbreviation etc.

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