Final step of the java_cpp_template -> java_cpp_enum migration.

ui/android/BUILD.gn

 import("//build/config/android/rules.gni")
 
 assert(is_android)
 
 java_cpp_enum("java_enums_srcjar") {
   sources = [
+    "../base/page_transition_types.h",
     "../base/window_open_disposition.h",
     "../gfx/android/java_bitmap.h",
   ]
   outputs = [
     "org/chromium/ui/WindowOpenDisposition.java",
+    "org/chromium/ui/base/PageTransition.java",
     "org/chromium/ui/gfx/BitmapFormat.java",
   ]
 }
 
-java_cpp_template("page_transition_types_srcjar") {
-  package_name = "org/chromium/ui/base"
-  sources = [
-    "java/PageTransitionTypes.template",
-  ]
-  inputs = [
-    "../base/page_transition_types_list.h",
-  ]
-}
-
 java_strings_grd("ui_strings_grd") {
   grd_file = "java/strings/android_ui_strings.grd"
   outputs = [
     "values-am/android_ui_strings.xml",
     "values-ar/android_ui_strings.xml",
     "values-bg/android_ui_strings.xml",
     "values-ca/android_ui_strings.xml",
     "values-cs/android_ui_strings.xml",
     "values-da/android_ui_strings.xml",
     "values-de/android_ui_strings.xml",
@@ skipping 48 matching lines @@
 }
 
 android_library("ui_java") {
   DEPRECATED_java_in_dir = "java/src"
   deps = [
     ":ui_java_resources",
     "//base:base_java",
   ]
   srcjar_deps = [
     ":java_enums_srcjar",
-    ":page_transition_types_srcjar",
   ]
 }