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This change causes chrome to attempt to locate and defer to an already running
chrome process earlier in startup (before chrome.dll is loaded).

Some benchmarks* (all times are in ms):

ASUS S200E (low-end netbook):
Unpatched: 1109, 547, 2656, 381
Patched:   125,  125,   78,  78

z620 (high-end dev machine)
Unpatched: 124, 125, 125, 219
Patched:    47,  63,  63,  46

chrome.exe size:
Unpatched: 748K
Patched:   768K

* The period measured was that between chrome.exe being executed and the existing chrome process receiving WM_COPYDATA.

BUG=171588
TBR=cpu@chromium.org, gab@chromium.org, grt@chromium.org, pastarmovj@chromium.org, shrikant@chromium.org, sky@chromium.org

Review URL: https://codereview.chromium.org/14617003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@204099 0039d316-1c4b-4281-b951-d872f2087c98