Fix GN label names for blink_heap_unittests, blink_platform_unittests.

third_party/WebKit/Source/platform/BUILD.gn

Index: third_party/WebKit/Source/platform/BUILD.gn
diff --git a/third_party/WebKit/Source/platform/BUILD.gn b/third_party/WebKit/Source/platform/BUILD.gn
index 1242951ad7ff8a450ffcd65640a5301e1d5225f1..6da7207438029ab546caa5ceb9d31322085e8093 100644
--- a/third_party/WebKit/Source/platform/BUILD.gn
+++ b/third_party/WebKit/Source/platform/BUILD.gn
@@ -336,10 +336,9 @@ source_set("test_support") {
 }
 
 # GYP: blink_heap_unittests
-test("heap_unittests") {
+test("blink_heap_unittests") {
   visibility = []  # Allow re-assignment of list.
   visibility = [ "*" ]
-  output_name = "blink_heap_unittests"
 
   sources = rebase_path(heap_gypi.platform_heap_test_files, ".", "heap")
   sources += [ "heap/RunAllTests.cpp" ]
@@ -371,10 +370,9 @@ test("heap_unittests") {
   }
 }
 
-test("platform_unittests") {
+test("blink_platform_unittests") {
   visibility = []  # Allow re-assignment of list.
   visibility = [ "*" ]
-  output_name = "blink_platform_unittests"
 
   sources = platform_test_files