Better support for changing => into {} functions.

[floitschG]

Say you have a method as follows:
method() => foo;

You want to change this into:
method() {
  return foo;
}

You start by placing yourself just before the '=>' and enter '{' which will automatically insert the closing '}'. Pressing enter will now yield:
method() {
} => foo;

What should happen:
The '=>' should be replaced with 'return' (unless the method is declared to be void) and the body should be moved inside the {}.

[clayberg]

Added this to the Later milestone.

[sethladd]

Removed this from the Later milestone.
Added this to the M6 milestone.

[clayberg]

Set owner to @scheglov.
Removed this from the M6 milestone.
Added this to the M7 milestone.

[scheglov]

There is Quick Assist (activated with Ctrl/Cmd+1) to convert between expression/block function body.

Left me know if you think that autotyping is better or should exist in addition to quick assist.

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Attachments:
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[Screen Shot 2013-09-17 at 11.29.35 AM.png](https://storage.googleapis.com/google-code-attachments/dart/issue-1842/comment-4/Screen Shot 2013-09-17 at 11.29.35 AM.png) (21.06 KB)

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Added AssumedStale label.