chrome: Put window_snapshot into chrome namespace.

chrome/test/perf/rendering/throughput_tests.cc

Index: chrome/test/perf/rendering/throughput_tests.cc
diff --git a/chrome/test/perf/rendering/throughput_tests.cc b/chrome/test/perf/rendering/throughput_tests.cc
index d745a4b084700c9ea412382e5af7da4ca7774b55..6772fb644b99cd1bb3054a5c07f20ad38bf5ef05 100644
--- a/chrome/test/perf/rendering/throughput_tests.cc
+++ b/chrome/test/perf/rendering/throughput_tests.cc
@@ -221,7 +221,7 @@ class ThroughputTest : public BrowserPerfTest {
                               tab_contents_bounds.height());
 
     gfx::NativeWindow native_window = browser()->window()->GetNativeWindow();
-    if (!browser::GrabWindowSnapshot(native_window, &png, snapshot_bounds)) {
+    if (!chrome::GrabWindowSnapshot(native_window, &png, snapshot_bounds)) {
       LOG(ERROR) << "browser::GrabWindowSnapShot() failed";
       return false;
     }