[PoC] Reformat all BUILD.gn and *.gni files with new gn.

components/proximity_auth/BUILD.gn

Index: components/proximity_auth/BUILD.gn
diff --git a/components/proximity_auth/BUILD.gn b/components/proximity_auth/BUILD.gn
index acca3e4f3c644e952d3ae04d3840cf37bcfec01b..78ace1675f0728850fabf011f603d7a1b47db5f0 100644
--- a/components/proximity_auth/BUILD.gn
+++ b/components/proximity_auth/BUILD.gn
@@ -70,11 +70,11 @@ source_set("proximity_auth") {
   ]
 
   deps = [
-    "cryptauth/proto",
-    "logging",
     "//base",
     "//device/bluetooth",
     "//net",
+    "cryptauth/proto",
+    "logging",
   ]
 }
 
@@ -95,9 +95,9 @@ source_set("test_support") {
   ]
 
   deps = [
-    "cryptauth:test_support",
     "//base",
     "//testing/gmock",
+    "cryptauth:test_support",
   ]
 }
 
@@ -128,14 +128,14 @@ source_set("unit_tests") {
   deps = [
     ":proximity_auth",
     ":test_support",
-    "ble:unit_tests",
-    "cryptauth:test_support",
-    "cryptauth:unit_tests",
-    "logging:unit_tests",
     "//base/test:test_support",
     "//device/bluetooth:mocks",
     "//testing/gmock",
     "//testing/gtest",
+    "ble:unit_tests",
+    "cryptauth:test_support",
+    "cryptauth:unit_tests",
+    "logging:unit_tests",
   ]
 }