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The hpack constant table was 40-60 KB (gcc: 40 KB, clang: 60KB), for 
storing 2 KB of data. Not optimal.

By making it an ordinary static data table we save 60 KB with clang:

Total change: -64153 bytes
==========================
  1 added, totalling +2056 bytes across 1 sources
  1 removed, totalling -66215 bytes across 1 sources
  1 grown, for a net change of +14 bytes (367 bytes before, 381 bytes after) across 1 sources
  1 shrunk, for a net change of -8 bytes (10504 bytes before, 10496 bytes after) across 1 sources

and save 40 KB with gcc:

Total change: -41382 bytes
==========================
  1 added, totalling +2056 bytes across 1 sources
  2 removed, totalling -43597 bytes across 2 sources
  1 grown, for a net change of +167 bytes (341 bytes before, 508 bytes after) across 1 sources
  1 shrunk, for a net change of -8 bytes (10576 bytes before, 10568 bytes after) across 1 sources

BUG=394269

Review URL: https://codereview.chromium.org/393573002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@284698 0039d316-1c4b-4281-b951-d872f2087c98