Revert "Fixing libyuv gn check."

This reverts commit b625f7b9.

Reason for revert: ios builds broke shortly after this CL, so trying a revert to get builds back to green.

Original change's description:
> Fixing libyuv gn check.
> 
> Starting from [1], GN is able to ensure that the inclusion or headers
> with relative paths is matched by a GN dependency.
> 
> This CL fixes the libyuv build graph according to GN.
> 
> [1] - https://chromium-review.googlesource.com/c/chromium/src/+/827014
> 
> Bug: webrtc:8850
> Change-Id: I7e0f9a8bd1ae2d205213dc75bf322be587efd1f5
> Reviewed-on: https://chromium-review.googlesource.com/903843
> Reviewed-by: Frank Barchard <fbarchard@chromium.org>
> Commit-Queue: Frank Barchard <fbarchard@chromium.org>

TBR=fbarchard@chromium.org,mbonadei@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.

Bug: webrtc:8850
Change-Id: I8585de252bd83e2c628a37b0a0d5324ed961209e
Reviewed-on: https://chromium-review.googlesource.com/912178Reviewed-by: Frank Barchard <fbarchard@chromium.org>
Commit-Queue: Frank Barchard <fbarchard@chromium.org>

BUILD.gn

@@ -48,7 +48,6 @@ group("default") {
 
 group("libyuv") {
   all_dependent_configs = [ ":libyuv_config" ]
-  deps = []
 
   if (is_win && target_cpu == "x64") {
     # Compile with clang in order to get inline assembly
@@ -61,19 +60,13 @@ group("libyuv") {
     ]
   }
 
-  if (libyuv_use_neon) {
-    deps += [ ":libyuv_neon" ]
-  }
-
-  if (libyuv_use_msa) {
-    deps += [ ":libyuv_msa" ]
-  }
-
   if (!is_ios) {
     # Make sure that clients of libyuv link with libjpeg. This can't go in
     # libyuv_internal because in Windows x64 builds that will generate a clang
     # build of libjpeg, and we don't want two copies.
-    deps += [ "//third_party:jpeg" ]
+    deps = [
+      "//third_party:jpeg",
+    ]
   }
 }
 
@@ -154,6 +147,14 @@ static_library("libyuv_internal") {
     deps += [ "//third_party:jpeg_includes" ]
   }
 
+  if (libyuv_use_neon) {
+    deps += [ ":libyuv_neon" ]
+  }
+
+  if (libyuv_use_msa) {
+    deps += [ ":libyuv_msa" ]
+  }
+
   # Always enable optimization for Release and NaCl builds (to workaround
   # crbug.com/538243).
   if (!is_debug || is_nacl) {
@@ -173,7 +174,6 @@ static_library("libyuv_internal") {
     ]
   }
 }
-
 if (libyuv_use_neon) {
   static_library("libyuv_neon") {
     sources = [
@@ -188,10 +188,6 @@ if (libyuv_use_neon) {
       "source/scale_neon64.cc",
     ]
 
-    deps = [
-      ":libyuv_internal",
-    ]
-
     public_configs = [ ":libyuv_config" ]
 
     # Always enable optimization for Release and NaCl builds (to workaround
@@ -221,10 +217,6 @@ if (libyuv_use_msa) {
       "source/scale_msa.cc",
     ]
 
-    deps = [
-      ":libyuv_internal",
-    ]
-
     public_configs = [ ":libyuv_config" ]
   }
 }