GN: Put static libs next to .ninja files in output dir

This puts static libraries on mac next to their ninja files, i.e. in
locations like out/Debug/obj/base/libbase_static.a instead of directly
in the output directory. This matches what we do on other platforms and
avoids the need to give every static library a unique name in the GN
build. https://codereview.chromium.org/376773002/ has some discussion
of the history of why this is different in GYP.

Review URL: https://codereview.chromium.org/378123002

Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: e486cea820233e75bdb5c9c994414db08da0fd33
diff --git a/tools/gn/ninja_helper.cc b/tools/gn/ninja_helper.cc
index 75843ee..cc03dd5 100644
--- a/tools/gn/ninja_helper.cc
+++ b/tools/gn/ninja_helper.cc
@@ -180,10 +180,7 @@
 
   // Binaries and loadable libraries go into the toolchain root.
   if (target->output_type() == Target::EXECUTABLE ||
-      (target->settings()->IsMac() &&
-          (target->output_type() == Target::SHARED_LIBRARY ||
-           target->output_type() == Target::STATIC_LIBRARY)) ||
-      (target->settings()->IsWin() &&
+      ((target->settings()->IsMac() || target->settings()->IsWin()) &&
        target->output_type() == Target::SHARED_LIBRARY)) {
     // Generate a name like "<toolchain>/<prefix><name>.<extension>".
     ret.value().append(prefix);