Don't compile code for desktop zoom or GuestViews on mobile platforms.

chrome/browser/BUILD.gn

Index: chrome/browser/BUILD.gn
diff --git a/chrome/browser/BUILD.gn b/chrome/browser/BUILD.gn
index 0458f182a97e6bf25417aed54dcb504a8833dac9..dc02a79b38361412cb1ea6b15ab3a38b2e726e97 100644
--- a/chrome/browser/BUILD.gn
+++ b/chrome/browser/BUILD.gn
@@ -1518,7 +1518,6 @@ split_static_library("browser") {
     "//components/flags_ui",
     "//components/gcm_driver",
     "//components/google/core/browser",
-    "//components/guest_view/browser",
     "//components/handoff",
     "//components/history/content/browser",
     "//components/history/core/browser",
@@ -1618,7 +1617,6 @@ split_static_library("browser") {
     "//components/web_resource",
     "//components/webdata/common",
     "//components/webdata_services",
-    "//components/zoom",
     "//content/app/resources",
     "//content/public/browser",
     "//content/public/common",
@@ -1712,6 +1710,7 @@ split_static_library("browser") {
     deps += [
       "//chrome/app/vector_icons",
       "//chrome/browser/resources:component_extension_resources",
+      "//components/zoom",
       "//net:net",
       "//ui/vector_icons",
     ]
@@ -1991,6 +1990,7 @@ split_static_library("browser") {
       "//chrome/common/extensions/api:api_registration",
       "//chrome/common/extensions/api:extensions_features",
       "//components/drive",
+      "//components/guest_view/browser",
       "//extensions/components/javascript_dialog_extensions_client",
       "//media/cast:net",
     ]