don't mix system and bundled ICU

The ICU 54.1 upgrade added a call to uloc_getDefault() to
base/test/test_suite.cc, but did not add a libicuuc dependency
to the corresponding gyp/gn targets.  This makes it possible to
mix system and bundled ICU headers (and will fail to build if
they differ in version).

BUG=428145

Review URL: https://codereview.chromium.org/943233002

Cr-Commit-Position: refs/heads/master@{#317616}

base/base.gyp

@@ -876,6 +876,7 @@
         'base_i18n',
         '../testing/gmock.gyp:gmock',
         '../testing/gtest.gyp:gtest',
+        '../third_party/icu/icu.gyp:icuuc',
         '../third_party/libxml/libxml.gyp:libxml',
         'third_party/dynamic_annotations/dynamic_annotations.gyp:dynamic_annotations',
       ],

base/test/BUILD.gn

@@ -116,6 +116,7 @@ source_set("test_support") {
     "//testing/gmock",
     "//testing/gtest",
     "//third_party/libxml",
+    "//third_party/icu:icuuc",
   ]
 
   if (!is_posix) {

extensions/extensions.gyp

@@ -53,6 +53,7 @@
         '../device/usb/usb.gyp:device_usb',
         '../ipc/ipc.gyp:ipc',
         '../net/net.gyp:net',
+        '../third_party/icu/icu.gyp:icuuc',
         '../third_party/re2/re2.gyp:re2',
         '../ui/base/ui_base.gyp:ui_base',
         '../ui/gfx/gfx.gyp:gfx_geometry',