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VC++ was initializing all of the static PathElement arrays in
GetPathForVectorIcon and GetPathForVectorIconAt1xScale at runtime, which
meant that these were the largest and sixth largest functions in
chrome.dll, and similarly in chrome_child.dll. Tagging the arrays and
types as constexpr shrinks these functions down to nothing, saves about
~50 KB of per-process private data, and actually helps them compile
slightly faster.

The approximate section size changes are:
       .text: -164224 bytes change
      .rdata:   51984 bytes change
       .data:  -54976 bytes change
      .reloc:  -23204 bytes change

These gains apply both to chrome.dll and chrome_child.dll.

BUG=679539

Review-Url: https://codereview.chromium.org/2620653004
Cr-Commit-Position: refs/heads/master@{#442751}