Convert test_support source sets to static libs

chrome/browser/BUILD.gn

Index: chrome/browser/BUILD.gn
diff --git a/chrome/browser/BUILD.gn b/chrome/browser/BUILD.gn
index 76d4fabfbb76330378e9d090c7d3df4c62284364..ef1dd4510e4dd42ef25e773f0f6e57fc4273d9c7 100644
--- a/chrome/browser/BUILD.gn
+++ b/chrome/browser/BUILD.gn
@@ -991,7 +991,7 @@ if (android_java_ui) {
 }
 
 if (is_win) {
-  source_set("chrome_process_finder") {
+  static_library("chrome_process_finder") {
     sources = [
       "win/chrome_process_finder.cc",
       "win/chrome_process_finder.h",
@@ -1325,7 +1325,7 @@ static_library("test_support") {
 }
 
 # In GYP this is part of test_support_ui.
-source_set("test_support_ui") {
+static_library("test_support_ui") {
   testonly = true
 
   # Always include this via the main test support UI target.
@@ -1352,7 +1352,7 @@ source_set("test_support_ui") {
 }
 
 if (enable_rlz_support) {
-  source_set("rlz") {
+  static_library("rlz") {
     sources =
         rebase_path(gypi_values.chrome_browser_rlz_sources, ".", "//chrome")
     deps = [
@@ -1368,7 +1368,7 @@ if (enable_rlz_support) {
 if (enable_pepper_cdms) {
   # These constants are separated so that test binaries can use them without
   # linking all of the test support.
-  source_set("pepper_cdm_test_constants") {
+  static_library("pepper_cdm_test_constants") {
     testonly = true
     visibility = [ "//chrome/*" ]
     sources = [