Upgrade to google-perftools revision 77....

DEPS

 vars = {
   "webkit_trunk":
     "http://svn.webkit.org/repository/webkit/trunk",
   "webkit_revision": "50313",
   "ffmpeg_revision": "30374",
 }
 
 deps = {
   "src/breakpad/src":
     "http://google-breakpad.googlecode.com/svn/trunk/src@417",
@@ skipping 46 matching lines @@
   "src/third_party/WebKit/JavaScriptCore":
     Var("webkit_trunk") + "/JavaScriptCore@" + Var("webkit_revision"),
 
   "src/third_party/WebKit/WebCore":
     Var("webkit_trunk") + "/WebCore@" + Var("webkit_revision"),
 
   "src/third_party/WebKit/WebKit/chromium":
     Var("webkit_trunk") + "/WebKit/chromium@" + Var("webkit_revision"),
 
   "src/third_party/tcmalloc/tcmalloc":
-    "http://google-perftools.googlecode.com/svn/trunk@74",
+    "http://google-perftools.googlecode.com/svn/trunk@77",
 
   "src/tools/page_cycler/acid3":
     "/trunk/deps/page_cycler/acid3@19546",
 
   # We run these layout tests as UI tests.  Since many of the buildbots that
   # run layout tests do NOT have access to the LayoutTest directory, we need
   # to map them here.  In practice, these do not take up much space.
   "src/chrome/test/data/layout_tests/LayoutTests/fast/events":
     Var("webkit_trunk") + "/LayoutTests/fast/events@" +
     Var("webkit_revision"),
@@ skipping 126 matching lines @@
                "$matching_files"],
   },
   {
     # Workaround XCode dependecies problem.
     # TODO(bradnelson): remove this when fixed.
     "pattern": ".",
     "action": ["python",
                "src/build/mac/clobber_generated_headers.py"],
   },
 ]