GN: Update heap stubs for android

Source/platform/BUILD.gn

Index: Source/platform/BUILD.gn
diff --git a/Source/platform/BUILD.gn b/Source/platform/BUILD.gn
index e80d157d9554da818315b10e3de8884ce53a6c00..0fe3d4b6432adf949c1c7fbc998af0d3f00265e0 100644
--- a/Source/platform/BUILD.gn
+++ b/Source/platform/BUILD.gn
@@ -7,7 +7,6 @@ import("//third_party/WebKit/Source/build/scripts/scripts.gni")
 import("//third_party/WebKit/Source/config.gni")
 import("//third_party/WebKit/Source/platform/platform.gni")
 import("//third_party/WebKit/Source/platform/platform_generated.gni")
-import("//third_party/yasm/yasm_assemble.gni")
 
 # Most targets in this file are private actions so use that as the default.
 visibility = ":*"
@@ -190,7 +189,6 @@ component("platform") {
   ]
 
   deps = [
-    ":heap_asm_stubs",
     ":make_platform_generated",
     "//gpu/command_buffer/client:gles2_c_lib",
     "//skia",
@@ -334,37 +332,6 @@ component("platform") {
   }
 }
 
-yasm_assemble("heap_asm_stubs") {
-  if (cpu_arch == "x86" || cpu_arch == "x64") {
-    sources = [ "heap/asm/SaveRegisters_x86.asm" ]
-  } else if (cpu_arch == "arm") {
-    sources = [ "heap/asm/SaveRegisters_arm.S" ]
-  } else if (cpu_arch == "arm64") {
-    sources = [ "heap/asm/SaveRegisters_arm64.S" ]
-  } else if (cpu_arch == "mipsel") {
-    sources = [ "heap/asm/SaveRegisters_mips.S" ]
-  }
-
-  yasm_flags = []
-  if (is_mac) {
-    # Necessary to ensure symbols end up with a _ prefix; added by
-    # yasm_compile.gypi for Windows, but not Mac.
-    yasm_flags += [ "-DPREFIX" ]
-  }
-  if (cpu_arch == "x64") {
-    if (is_win) {
-      yasm_flags += [ "-DX64WIN=1" ]
-    } else {
-      yasm_flags += [ "-DX64POSIX=1" ]
-    }
-  } else if (cpu_arch == "x86") {
-    yasm_flags += [ "-DIA32=1" ]
-  } else if (cpu_arch == "arm") {
-    yasm_flags += [ "-DARM=1" ]
-  }
-}
-
-
 test("heap_unittests") {
   visibility = "//third_party/WebKit/*"
   output_name = "blink_heap_unittests"