Change deployment target for iOS to 6.0

build/common.gypi

 # Copyright (c) 2012 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.
 
 # IMPORTANT:
 # Please don't directly include this file if you are building via gyp_chromium,
 # since gyp_chromium is automatically forcing its inclusion.
 {
   # Variables expected to be overriden on the GYP command line (-D) or by
   # ~/.gyp/include.gypi.
@@ skipping 1160 matching lines @@
           'fr', 'he', 'hr', 'hu', 'id', 'it', 'ja', 'ko', 'ms', 'nb', 'nl',
           'pl', 'pt', 'pt-PT', 'ro', 'ru', 'sk', 'sv', 'th', 'tr', 'uk', 'vi',
           'zh-CN', 'zh-TW',
         ],
 
         # The Mac SDK is set for iOS builds and passed through to Mac
         # sub-builds. This allows the Mac sub-build SDK in an iOS build to be
         # overridden from the command line the same way it is for a Mac build.
         'mac_sdk%': '<!(python <(DEPTH)/build/mac/find_sdk.py 10.6)',
 
-        # iOS SDK and deployment target support.  The iOS 5.0 SDK is actually
-        # what is required, but the value is left blank so when it is set in
-        # the project files it will be the "current" iOS SDK.  Forcing 5.0
-        # even though it is "current" causes Xcode to spit out a warning for
-        # every single project file for not using the "current" SDK.
+        # iOS SDK and deployment target support.  The |ios_sdk| value is left
+        # blank so that when it is set in the project files it will be the
+        # "current" iOS SDK.  Forcing a specific SDK even if it is "current"
+        # causes Xcode to spit out a warning for every single project file for
+        # not using the "current" SDK.
         'ios_sdk%': '',
         'ios_sdk_path%': '',
-        'ios_deployment_target%': '5.0',
+        'ios_deployment_target%': '6.0',
 
         'conditions': [
           # ios_product_name is set to the name of the .app bundle as it should
           # appear on disk.
           ['branding=="Chrome"', {
             'ios_product_name%': 'Chrome',
           }, { # else: branding!="Chrome"
             'ios_product_name%': 'Chromium',
           }],
           ['branding=="Chrome" and buildtype=="Official"', {
@@ skipping 3488 matching lines @@
     # settings in target dicts.  SYMROOT is a special case, because many other
     # Xcode variables depend on it, including variables such as
     # PROJECT_DERIVED_FILE_DIR.  When a source group corresponding to something
     # like PROJECT_DERIVED_FILE_DIR is added to a project, in order for the
     # files to appear (when present) in the UI as actual files and not red
     # red "missing file" proxies, the correct path to PROJECT_DERIVED_FILE_DIR,
     # and therefore SYMROOT, needs to be set at the project level.
     'SYMROOT': '<(DEPTH)/xcodebuild',
   },
 }