Google V8: use system ICU instead of supplied as 3rd pty

--- a/DEPS
+++ b/DEPS
@@ -5,10 +5,7 @@
 deps = {
   # Remember to keep the revision in sync with the Makefile.
   "v8/build/gyp":
-    "http://gyp.googlecode.com/svn/trunk@1831",
-
-  "v8/third_party/icu":
-    "https://src.chromium.org/chrome/trunk/deps/third_party/icu46@239289",
+    "http://gyp.googlecode.com/svn/trunk@1836",
 }

 deps_os = {
--- a/Makefile
+++ b/Makefile
@@ -441,7 +441,4 @@ grokdump: ia32.release
 # Remember to keep these in sync with the DEPS file.
 dependencies:
    svn checkout --force http://gyp.googlecode.com/svn/trunk build/gyp \
-       --revision 1831
-   svn checkout --force \
-       https://src.chromium.org/chrome/trunk/deps/third_party/icu46 \
-       third_party/icu --revision 239289
+       --revision 1836
--- a/build/standalone.gypi
+++ b/build/standalone.gypi
@@ -93,7 +93,7 @@
     'v8_optimized_debug%': 0,

     # Relative path to icu.gyp from this file.
-    'icu_gyp_path': '../third_party/icu/icu.gyp',
+#   'icu_gyp_path': '../third_party/icu/icu.gyp',

     'conditions': [
       ['(v8_target_arch=="arm" and host_arch!="arm") or \
--- a/samples/samples.gyp
+++ b/samples/samples.gyp
@@ -41,15 +41,15 @@
     ],
     'conditions': [
       ['v8_enable_i18n_support==1', {
-        'dependencies': [
-          '<(icu_gyp_path):icui18n',
-          '<(icu_gyp_path):icuuc',
-        ],
+        'link_settings': { 'libraries': [
+          '-licui18n',
+          '-licuuc'
+        ], },
       }],
       ['OS=="win" and v8_enable_i18n_support==1', {
-        'dependencies': [
-          '<(icu_gyp_path):icudata',
-        ],
+        'link_settings': { 'libraries': [
+          '-licudata'
+        ], },
       }],
     ],
   },
--- a/src/d8.gyp
+++ b/src/d8.gyp
@@ -81,15 +81,15 @@
           ],
         }],
         ['v8_enable_i18n_support==1', {
-          'dependencies': [
-            '<(icu_gyp_path):icui18n',
-            '<(icu_gyp_path):icuuc',
-          ],
+          'link_settings': { 'libraries': [
+            '-licui18n',
+            '-licuuc'
+          ], },
         }],
         ['OS=="win" and v8_enable_i18n_support==1', {
-          'dependencies': [
-            '<(icu_gyp_path):icudata',
-          ],
+          'link_settings': { 'libraries': [
+            '-licudata'
+          ], },
         }],
       ],
     },
--- a/tools/gcmole/gcmole.lua
+++ b/tools/gcmole/gcmole.lua
@@ -105,8 +105,8 @@ local function MakeClangCommandLine(plugin, plugin_args, triple, arch_define)
       .. " -DENABLE_DEBUGGER_SUPPORT"
       .. " -DV8_I18N_SUPPORT"
       .. " -Isrc"
-      .. " -Ithird_party/icu/source/common"
-      .. " -Ithird_party/icu/source/i18n"
+--    .. " -Ithird_party/icu/source/common"
+--    .. " -Ithird_party/icu/source/i18n"
 end

 function InvokeClangPluginForEachFile(filenames, cfg, func)
--- a/tools/gyp/v8.gyp
+++ b/tools/gyp/v8.gyp
@@ -952,10 +952,10 @@
           ]
         }],
         ['v8_enable_i18n_support==1', {
-          'dependencies': [
-            '<(icu_gyp_path):icui18n',
-            '<(icu_gyp_path):icuuc',
-          ]
+          'link_settings': { 'libraries': [
+            '-licui18n',
+            '-licuuc'
+          ], },
         }, {  # v8_enable_i18n_support==0
           'sources!': [
             '../../src/i18n.cc',
@@ -963,9 +963,9 @@
           ],
         }],
         ['OS=="win" and v8_enable_i18n_support==1', {
-          'dependencies': [
-            '<(icu_gyp_path):icudata',
-          ],
+          'link_settings': { 'libraries': [
+            '-licudata'
+          ], },
         }],
         ['v8_use_default_platform==0', {
           'sources!': [
--- a/tools/lexer-shell.gyp
+++ b/tools/lexer-shell.gyp
@@ -40,10 +40,10 @@
       ],
       'conditions': [
         ['v8_enable_i18n_support==1', {
-          'dependencies': [
-            '<(icu_gyp_path):icui18n',
-            '<(icu_gyp_path):icuuc',
-          ],
+          'link_settings': { 'libraries': [
+            '-licui18n',
+            '-licuuc'
+          ], },
         }],
       ],
       'include_dirs+': [