Fix mistake in r229993.

build/android/buildbot/bb_host_steps.py

Index: build/android/buildbot/bb_host_steps.py
diff --git a/build/android/buildbot/bb_host_steps.py b/build/android/buildbot/bb_host_steps.py
index 5acbaa6435c239b61f0a2f85f3a48ad975749ac0..8fccbda85167e03ea8a5c77f2ed226a66a1ec74e 100755
--- a/build/android/buildbot/bb_host_steps.py
+++ b/build/android/buildbot/bb_host_steps.py
@@ -17,6 +17,8 @@ SLAVE_SCRIPTS_DIR = os.path.join(bb_utils.BB_BUILD_DIR, 'scripts', 'slave')
 VALID_HOST_TESTS = set(['check_webview_licenses', 'findbugs'])
 EXPERIMENTAL_TARGETS = ['android_experimental']
 
+DIR_BUILD_ROOT = os.path.dirname(constants.DIR_SOURCE_ROOT)
+
 # Short hand for RunCmd which is used extensively in this file.
 RunCmd = bb_utils.RunCmd
 
@@ -58,13 +60,15 @@ def Compile(options):
   build_targets = options.build_targets.split(',')
   bb_annotations.PrintNamedStep('compile')
   for build_target in build_targets:
-    RunCmd(cmd + ['--build-args=%s' % build_target], halt_on_failure=True)
+    RunCmd(cmd + ['--build-args=%s' % build_target],
+        halt_on_failure=True,
+        cwd=DIR_BUILD_ROOT)
   if options.experimental:
     for compile_target in EXPERIMENTAL_TARGETS:
       bb_annotations.PrintNamedStep('Experimental Compile %s' % compile_target)
       RunCmd(cmd + ['--build-args=%s' % compile_target],
              flunk_on_failure=False,
-             cwd=constants.DIR_SOURCE_ROOT)
+             cwd=DIR_BUILD_ROOT)
 
 
 def ZipBuild(options):
@@ -74,7 +78,7 @@ def ZipBuild(options):
       '--src-dir', constants.DIR_SOURCE_ROOT,
       '--build-dir', SrcPath('out'),
       '--exclude-files', 'lib.target,gen,android_webview,jingle_unittests']
-      + bb_utils.EncodeProperties(options), cwd=constants.DIR_SOURCE_ROOT)
+      + bb_utils.EncodeProperties(options), cwd=DIR_BUILD_ROOT)
 
 
 def ExtractBuild(options):
@@ -83,7 +87,7 @@ def ExtractBuild(options):
       [os.path.join(SLAVE_SCRIPTS_DIR, 'extract_build.py'),
        '--build-dir', SrcPath('build'), '--build-output-dir',
        SrcPath('out')] + bb_utils.EncodeProperties(options),
-       warning_code=1, cwd=constants.DIR_SOURCE_ROOT)
+       warning_code=1, cwd=DIR_BUILD_ROOT)
 
 
 def FindBugs(options):