This moves all of the remaining 32-bit linux builders onto 64-bit hosts.

masters/master.chromium.linux/slaves.cfg

Index: masters/master.chromium.linux/slaves.cfg
diff --git a/masters/master.chromium.linux/slaves.cfg b/masters/master.chromium.linux/slaves.cfg
index cd400a90cd5b6ddd37870f5d05a39bd6114d5f32..204f4670b8f1cab6df175a292778dc1954a622a8 100644
--- a/masters/master.chromium.linux/slaves.cfg
+++ b/masters/master.chromium.linux/slaves.cfg
@@ -30,11 +30,11 @@ slaves = [
   },
   {
     'master': 'ChromiumLinux',
-    'hostname': 'vm871-m1',
+    'hostname': 'vm924-m1',
     'builder': 'Linux Tests (dbg)(1)(32)',
     'os': 'linux',
     'version': 'precise',
-    'bits': '32',
+    'bits': '64',
   },
   {
     'master': 'ChromiumLinux',
@@ -47,10 +47,10 @@ slaves = [
   {
     'master': 'ChromiumLinux',
     'builder': 'Linux Builder (dbg)(32)',
-    'hostname': 'build12-m1',
+    'hostname': 'build45-m1',
     'os': 'linux',
     'version': 'precise',
-    'bits': '32',
+    'bits': '64',
   },
   {
     'master': 'ChromiumLinux',