Put 'tools' directory at front of import path.

build/gyp_chromium

Index: build/gyp_chromium
diff --git a/build/gyp_chromium b/build/gyp_chromium
index 45f320603ad98d8ae578403ba7d3e8b6ef75d720..4ed15bac29c625703530aced70f5ebb1dd64dc32 100755
--- a/build/gyp_chromium
+++ b/build/gyp_chromium
@@ -30,9 +30,6 @@ SRC_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
 # Add paths so that pymod_do_main(...) can import files.
 sys.path.insert(1, os.path.join(chrome_src, 'android_webview', 'tools'))
 sys.path.insert(1, os.path.join(chrome_src, 'build', 'android', 'gyp'))
-sys.path.insert(1, os.path.join(chrome_src, 'tools'))
-sys.path.insert(1, os.path.join(chrome_src, 'tools', 'generate_shim_headers'))
-sys.path.insert(1, os.path.join(chrome_src, 'tools', 'grit'))
 sys.path.insert(1, os.path.join(chrome_src, 'chrome', 'tools', 'build'))
 sys.path.insert(1, os.path.join(chrome_src, 'chromecast', 'tools', 'build'))
 sys.path.insert(1, os.path.join(chrome_src, 'native_client', 'build'))
@@ -42,6 +39,9 @@ sys.path.insert(1, os.path.join(chrome_src, 'remoting', 'tools', 'build'))
 sys.path.insert(1, os.path.join(chrome_src, 'third_party', 'liblouis'))
 sys.path.insert(1, os.path.join(chrome_src, 'third_party', 'WebKit',
     'Source', 'build', 'scripts'))
+sys.path.insert(1, os.path.join(chrome_src, 'tools'))
+sys.path.insert(1, os.path.join(chrome_src, 'tools', 'generate_shim_headers'))
+sys.path.insert(1, os.path.join(chrome_src, 'tools', 'grit'))
 
 # On Windows, Psyco shortens warm runs of build/gyp_chromium by about
 # 20 seconds on a z600 machine with 12 GB of RAM, from 90 down to 70