Move WebCacheMemoryDumpProvider to platform

Move WebCacheMemoryDumpProvider to platform

Also rename it as MemoryCacheDumpProvider and make it inherit from
base::trace_event::MemoryDumpProvider directly.

After this CL, no dumper inherits from WebMemoryDumpProvider so we can
start removing it.

BUG=605822
Committed: https://crrev.com/8c2c70ba86e139bd1143be9c65976ed0720d7c30
Cr-Commit-Position: refs/heads/master@{#395019}

[bashi, 2016-05-20 03:24:29]

bashi@chromium.org changed reviewers:
+ haraken@chromium.org

[bashi, 2016-05-20 03:24:30]

PTAL?

Might look not worth doing, but actual work comes after this CL...

[haraken, 2016-05-20 03:43:39]

LGTM

[bashi, 2016-05-20 04:24:30]

The CQ bit was checked by bashi@chromium.org

[bashi, 2016-05-20 04:24:30]

The patchset sent to the CQ was uploaded after l-g-t-m from haraken@chromium.org
Link to the patchset: https://codereview.chromium.org/1999613002/#ps20001
(title: "Fix link error on win")

[commit-bot: I haz the power, 2016-05-20 04:24:48]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1999613002/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1999613002/20001

[commit-bot: I haz the power, 2016-05-20 06:32:57]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-05-20 06:35:09]

Description was changed from

==========
Move WebCacheMemoryDumpProvider to platform

Also rename it as MemoryCacheDumpProvider and make it inherit from
base::trace_event::MemoryDumpProvider directly.

After this CL, no dumper inherits from WebMemoryDumpProvider so we can
start removing it.

BUG=605822
==========

to

==========
Move WebCacheMemoryDumpProvider to platform

Also rename it as MemoryCacheDumpProvider and make it inherit from
base::trace_event::MemoryDumpProvider directly.

After this CL, no dumper inherits from WebMemoryDumpProvider so we can
start removing it.

BUG=605822

Committed: https://crrev.com/8c2c70ba86e139bd1143be9c65976ed0720d7c30
Cr-Commit-Position: refs/heads/master@{#395019}
==========

[commit-bot: I haz the power, 2016-05-20 06:35:10]

Patchset 2 (id:??) landed as
https://crrev.com/8c2c70ba86e139bd1143be9c65976ed0720d7c30
Cr-Commit-Position: refs/heads/master@{#395019}