Only disable cfi-icall when use_system_libjpeg=true

Bug: 866290
Change-Id: Ic5d175b3b854665f50781650406d599d09ee9849
Reviewed-on: https://chromium-review.googlesource.com/1157136Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Vlad Tsyrklevich <vtsyrklevich@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579614}

third_party/blink/renderer/platform/image-decoders/jpeg/jpeg_image_decoder.cc

@@ -643,7 +643,10 @@ class JPEGImageReader final {
   IntSize UvSize() const { return uv_size_; }
 
  private:
-  NO_SANITIZE_CFI_ICALL JSAMPARRAY AllocateSampleArray() {
+#if defined(USE_SYSTEM_LIBJPEG)
+  NO_SANITIZE_CFI_ICALL
+#endif
+  JSAMPARRAY AllocateSampleArray() {
 // Some output color spaces don't need the sample array: don't allocate in that
 // case.
 #if defined(TURBO_JPEG_RGB_SWIZZLE)