Use framework includes in ios/web_view/shell.

ios/web_view/shell/BUILD.gn

Index: ios/web_view/shell/BUILD.gn
diff --git a/ios/web_view/shell/BUILD.gn b/ios/web_view/shell/BUILD.gn
index 4e08849fab07ba026a842b01249caff68a7c763e..ee8a57be247479933e1b38a729964f3ab810bc38 100644
--- a/ios/web_view/shell/BUILD.gn
+++ b/ios/web_view/shell/BUILD.gn
@@ -9,8 +9,6 @@ ios_app_bundle("ios_web_view_shell") {
 
   deps = [
     ":shell",
-    "//ios/web_view",
-    "//ios/web_view:web_view+link",
   ]
   bundle_deps = [ "//ios/web_view:web_view+bundle" ]
 
@@ -30,18 +28,9 @@ source_set("shell") {
     "translate_controller.m",
   ]
 
-  # A workaround for an issue that we need to use the form:
-  #   #include "ios/web_view/public/cwv_export.h"
-  # instead of:
-  #   #include <ChromeWebView/cwv_export.h>
-  # when building this app.
-  #
-  # TODO(crbug.com/704946): Solve the issue and remove this workaround.
-  defines = [ "CWV_IMPLEMENTATION" ]
-
   deps = [
     ":resources",
-    "//ios/web_view",
+    "//ios/web_view:web_view+link",
   ]
 
   libs = [