[sqlite] Remove WebDatabase externs and depend on what you use.

Source/core/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.
 
 import("//build/config/chrome_build.gni")
 import("//build/config/ui.gni")
 import("//third_party/WebKit/Source/bindings/bindings.gni")
 import("//third_party/WebKit/Source/bindings/core/v8/generated.gni")
 import("//third_party/WebKit/Source/bindings/modules/modules.gni")
 import("//third_party/WebKit/Source/bindings/modules/v8/generated.gni")
@@ skipping 66 matching lines @@
 }
 
 # GYP version: WebKit/Source/core/core.gyp:webcore_prerequisites
 source_set("prerequisites") {
   public_deps = [
     "//third_party/WebKit/Source/wtf",
     "//gpu/command_buffer/client:gles2_c_lib",
     "//skia",
     "//third_party/angle:translator",
     "//third_party/iccjpeg",
+    "//third_party/icu",
     "//third_party/libpng",
     "//third_party/libwebp",
     "//third_party/libxml",
     "//third_party/libxslt",
     "//third_party/npapi",
     "//third_party/ots",
     "//third_party/qcms",
     "//third_party/snappy",
     "//third_party/sqlite",
     "//third_party/zlib",
@@ skipping 943 matching lines @@
     "$blink_core_output_dir/{{source_name_part}}.h",
   ]
   args = [
     "{{source}}",
     rel_blink_core_gen_dir,
     bison_exe,
   ]
 
   deps = make_core_generated_deps
 }