from gentoo chromium-tcmalloc-r1.patch

--- chrome/renderer/chrome_render_process_observer.cc.orig	2012-05-16 20:01:13.000000000 +0200
+++ chrome/renderer/chrome_render_process_observer.cc	2012-05-16 20:01:41.000000000 +0200
@@ -35,7 +35,6 @@
 #include "net/base/net_errors.h"
 #include "net/base/net_module.h"
 #include "third_party/sqlite/sqlite3.h"
-#include "third_party/tcmalloc/chromium/src/gperftools/heap-profiler.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebCache.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebCrossOriginPreflightResultCache.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebDocument.h"
@@ -47,6 +45,11 @@
 #include "base/win/iat_patch_function.h"
 #endif
 
+#if defined(USE_TCMALLOC)
+#include "third_party/tcmalloc/chromium/src/gperftools/heap-profiler.h"
+#include "third_party/tcmalloc/chromium/src/gperftools/malloc_extension.h"
+#endif
+
 using WebKit::WebCache;
 using WebKit::WebCrossOriginPreflightResultCache;
 using WebKit::WebFontCache;