Cleanup: Normalize liscence headers in modules/crypto/*.

Before there were 4 different styles of headers:
  (style A): 25
  (style B): 4
  (style C): 2
  (style D): 1

After this change, there are only 2 styles of headers:
  (style A): 29
  (style B): 3 (Crypto.idl, Crypto.h, Crypto.cpp)

All of the files using (style A) are ones which I added while working on WebCrypto, so there shouldn't be any issues with changing them.

The files using (style B) are ones which predated my work so I decided to left them untouched.

BUG=245025
R=abarth@chromium.org

Review URL: https://codereview.chromium.org/19589004

git-svn-id: svn://svn.chromium.org/blink/trunk@154437 bbb929c8-8fbe-4397-9dbb-9b2b20218538