More memory stats code cleanup:
Move GetSystemCommitCharge() into bsae\process_util*.
Kill PrintChromeMemoryUsageInfo(), which was only used by
reliability_tests.exe on Windows and whose stats are obsolete.
Delete the now-unnecessary chrome\test\perf\mem_usage* files.
BUG=none
TEST=none
Review URL: http://codereview.chromium.org/371025

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@31423 0039d316-1c4b-4281-b951-d872f2087c98

diff --git a/base/process_util.h b/base/process_util.h
index 135b92e..85b295b 100644
--- a/base/process_util.h
+++ b/base/process_util.h

@@ -420,6 +420,10 @@
   DISALLOW_EVIL_CONSTRUCTORS(ProcessMetrics);
 };
 
+// Returns the memory commited by the system in KBytes.
+// Returns 0 if it can't compute the commit charge.
+size_t GetSystemCommitCharge();
+
 // Enables low fragmentation heap (LFH) for every heaps of this process. This
 // won't have any effect on heaps created after this function call. It will not
 // modify data allocated in the heaps before calling this function. So it is