iOS: Re-add bits of GTM we actually use.

third_party/google_toolbox_for_mac/BUILD.gn

 # Copyright 2014 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 config("google_toolbox_for_mac_public_config") {
   include_dirs = [
     ".",
     "src",
     "src/AppKit",
     "src/DebugUtils",
@@ skipping 42 matching lines @@
 
     libs = [
       "AddressBook.framework",
       "AppKit.framework",
       "Carbon.framework",
       "Cocoa.framework",
       "QuartzCore.framework",
     ]
   } else {  # is_ios
     sources += [
+      "src/DebugUtils/GTMMethodCheck.h",
+      "src/DebugUtils/GTMMethodCheck.m",
       "src/Foundation/GTMLightweightProxy.h",
       "src/Foundation/GTMLightweightProxy.m",
 
       # GTMLogger is used by breakpad, which is still used on iOS.
       "src/Foundation/GTMLogger.h",
       "src/Foundation/GTMLogger.m",
+      "src/Foundation/GTMNSDictionary+URLArguments.h",
+      "src/Foundation/GTMNSDictionary+URLArguments.m",
       "src/Foundation/GTMNSString+URLArguments.h",
       "src/Foundation/GTMNSString+URLArguments.m",
       "src/iPhone/GTMFadeTruncatingLabel.h",
       "src/iPhone/GTMFadeTruncatingLabel.m",
       "src/iPhone/GTMRoundedRectPath.h",
       "src/iPhone/GTMRoundedRectPath.m",
       "src/iPhone/GTMUIImage+Resize.h",
       "src/iPhone/GTMUIImage+Resize.m",
       "src/iPhone/GTMUILocalizer.h",
       "src/iPhone/GTMUILocalizer.m",
     ]
 
     # TODO(crbug.com/569158): Suppresses warnings that are treated as errors
     # when minimum iOS version support is increased to iOS 9 and up.
     # This should be removed once all deprecation violations have been fixed.
     cflags = [ "-Wno-deprecated-declarations" ]
   }
 
   if (is_component_build) {
     # GTM is third-party code, so we don't want to add _EXPORT
     # annotations to it, so build it without -fvisibility=hidden
     # (else the interface class symbols will be hidden in a 64bit
     # build). Only do this in a component build, so that the shipping
     # chrome binary doesn't end up with unnecessarily exported
     # symbols.
     configs -= [ "//build/config/gcc:symbol_visibility_hidden" ]
     configs += [ "//build/config/gcc:symbol_visibility_default" ]
   }
 }