[ios] Convert GN libs lists to frameworks in //ios/web_view.

GN recently added support for Apple frameworks to link, rather than
overloading the libs lists. This pulls .frameworks out of the libs
lists, so that GN can stop supporting .frameworks in libs in the
future.

Bug: 1052560
Change-Id: Idb6c7d282e04ff7bf3dadc19767a78806be40499
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2276283
Auto-Submit: Sylvain Defresne <sdefresne@chromium.org>
Commit-Queue: Mike Dougherty <michaeldo@chromium.org>
Reviewed-by: Mike Dougherty <michaeldo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#784409}

ios/web_view/BUILD.gn

@@ -25,7 +25,7 @@ group("all_tests") {
 
 config("config") {
   defines = [ "CWV_IMPLEMENTATION" ]
-  libs = [
+  frameworks = [
     "CoreGraphics.framework",
     "Foundation.framework",
     "MobileCoreServices.framework",

ios/web_view/shell/BUILD.gn

@@ -114,7 +114,8 @@ source_set("shell") {
     ios_web_view_shell_risk_data_loader,
   ]
 
-  libs = [
+  libs = [ "resolv" ]
+  frameworks = [
     "CFNetwork.framework",
     "CoreFoundation.framework",
     "CoreGraphics.framework",
@@ -125,7 +126,6 @@ source_set("shell") {
     "Security.framework",
     "SystemConfiguration.framework",
     "UIKit.framework",
-    "resolv",
   ]
 
   configs += [ "//build/config/compiler:enable_arc" ]